Complex classes like transactions often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use transactions, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 19 | class transactions extends main  | 
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| 20 | { | 
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| 21 | /**  | 
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| 22 | * Data for this entity  | 
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| 23 | *  | 
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| 24 | * @var array  | 
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| 25 | * transaction_id  | 
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| 26 | * txn_id  | 
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| 27 | * txn_type  | 
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| 28 | * confirmed  | 
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| 29 | * user_id  | 
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| 30 | * item_name  | 
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| 31 | * item_number  | 
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| 32 | * business  | 
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| 33 | * receiver_id  | 
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| 34 | * receiver_email  | 
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| 35 | * payment_status  | 
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| 36 | * mc_gross  | 
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| 37 | * mc_fee  | 
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| 38 | * mc_currency  | 
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| 39 | * settle_amount  | 
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| 40 | * settle_currency  | 
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| 41 | * net_amount  | 
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| 42 | * exchange_rate  | 
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| 43 | * payment_type  | 
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| 44 | * payment_date  | 
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| 45 | * payer_id  | 
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| 46 | * payer_email  | 
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| 47 | * payer_status  | 
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| 48 | * first_name  | 
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| 49 | * last_name  | 
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| 50 | * @access protected  | 
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| 51 | */  | 
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| 52 | protected $data;  | 
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| 53 | protected $extra_data;  | 
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| 54 | protected $transactions_log_table;  | 
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| 55 | |||
| 56 | /**  | 
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| 57 | * Constructor  | 
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| 58 | *  | 
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| 59 | * @param \phpbb\db\driver\driver_interface $db Database object  | 
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| 60 | * @param \phpbb\user $user User object  | 
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| 61 | * @param string $table_name Name of the table used to store data  | 
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| 62 | *  | 
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| 63 | * @access public  | 
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| 64 | */  | 
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| 65 | public function __construct(\phpbb\db\driver\driver_interface $db, \phpbb\user $user, $table_name)  | 
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| 109 | |||
| 110 | /**  | 
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| 111 | * Check the txn_id exist from the database for this transaction  | 
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| 112 | *  | 
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| 113 | * @return int $this->data['txn_id'] Transaction identifier; 0 if the transaction doesn't exist  | 
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| 114 | * @access public  | 
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| 115 | */  | 
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| 116 | public function transaction_exists()  | 
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| 125 | |||
| 126 | /**  | 
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| 127 | * Get PayPal transaction id  | 
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| 128 | *  | 
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| 129 | * @return string  | 
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| 130 | * @access public  | 
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| 131 | */  | 
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| 132 | public function get_txn_id()  | 
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| 136 | |||
| 137 | /**  | 
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| 138 | * Get PayPal receiver ID  | 
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| 139 | *  | 
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| 140 | * @return string  | 
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| 141 | * @access public  | 
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| 142 | */  | 
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| 143 | public function get_receiver_id()  | 
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| 147 | |||
| 148 | /**  | 
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| 149 | * Get PayPal receiver e-mail  | 
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| 150 | *  | 
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| 151 | * @return string  | 
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| 152 | * @access public  | 
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| 153 | */  | 
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| 154 | public function get_receiver_email()  | 
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| 158 | |||
| 159 | /**  | 
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| 160 | * Get PayPal receiver ID  | 
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| 161 | *  | 
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| 162 | * @return string  | 
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| 163 | * @access public  | 
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| 164 | */  | 
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| 165 | public function get_residence_country()  | 
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| 169 | |||
| 170 | /**  | 
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| 171 | * Get PayPal business (same as receiver ID or receiver_email)  | 
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| 172 | *  | 
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| 173 | * @return string  | 
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| 174 | * @access public  | 
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| 175 | */  | 
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| 176 | public function get_business()  | 
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| 180 | |||
| 181 | /**  | 
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| 182 | * Get PayPal transaction status  | 
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| 183 | *  | 
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| 184 | * @return bool  | 
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| 185 | * @access public  | 
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| 186 | */  | 
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| 187 | public function get_confirmed()  | 
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| 191 | |||
| 192 | /**  | 
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| 193 | * Get Test IPN status  | 
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| 194 | *  | 
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| 195 | * @return bool  | 
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| 196 | * @access public  | 
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| 197 | */  | 
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| 198 | public function get_test_ipn()  | 
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| 202 | |||
| 203 | /**  | 
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| 204 | * Get PayPal transaction type  | 
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| 205 | *  | 
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| 206 | * @return string  | 
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| 207 | * @access public  | 
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| 208 | */  | 
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| 209 | public function get_txn_type()  | 
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| 213 | |||
| 214 | /**  | 
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| 215 | * Get PayPal parent transaction ID (in case of refund)  | 
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| 216 | *  | 
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| 217 | * @return string  | 
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| 218 | * @access public  | 
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| 219 | */  | 
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| 220 | public function get_parent_txn_id()  | 
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| 224 | |||
| 225 | /**  | 
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| 226 | * Get PayPal payer e-mail  | 
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| 227 | *  | 
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| 228 | * @return string  | 
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| 229 | * @access public  | 
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| 230 | */  | 
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| 231 | public function get_payer_email()  | 
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| 235 | |||
| 236 | /**  | 
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| 237 | * Get PayPal payer account ID  | 
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| 238 | *  | 
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| 239 | * @return string  | 
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| 240 | * @access public  | 
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| 241 | */  | 
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| 242 | public function get_payer_id()  | 
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| 246 | |||
| 247 | /**  | 
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| 248 | * Get PayPal payer Status (such as unverified/verified)  | 
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| 249 | *  | 
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| 250 | * @return string  | 
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| 251 | * @access public  | 
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| 252 | */  | 
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| 253 | public function get_payer_status()  | 
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| 257 | |||
| 258 | /**  | 
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| 259 | * Get PayPal payer first name  | 
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| 260 | *  | 
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| 261 | * @return string  | 
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| 262 | * @access public  | 
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| 263 | */  | 
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| 264 | public function get_first_name()  | 
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| 268 | |||
| 269 | /**  | 
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| 270 | * Get PayPal payer last name  | 
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| 271 | *  | 
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| 272 | * @return string  | 
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| 273 | * @access public  | 
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| 274 | */  | 
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| 275 | public function get_last_name()  | 
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| 279 | |||
| 280 | /**  | 
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| 281 | * Get member user_id  | 
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| 282 | *  | 
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| 283 | * @return integer  | 
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| 284 | * @access public  | 
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| 285 | */  | 
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| 286 | public function get_user_id()  | 
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| 290 | |||
| 291 | /**  | 
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| 292 | * Get member username  | 
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| 293 | *  | 
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| 294 | * @return string  | 
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| 295 | * @access public  | 
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| 296 | */  | 
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| 297 | public function get_username()  | 
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| 301 | |||
| 302 | /**  | 
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| 303 | * Get PayPal payer last name  | 
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| 304 | *  | 
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| 305 | * @return string  | 
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| 306 | * @access public  | 
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| 307 | */  | 
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| 308 | public function get_custom()  | 
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| 312 | |||
| 313 | /**  | 
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| 314 | * Get PayPal item name  | 
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| 315 | *  | 
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| 316 | * @return string  | 
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| 317 | * @access public  | 
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| 318 | */  | 
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| 319 | public function get_item_name()  | 
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| 323 | |||
| 324 | /**  | 
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| 325 | * Get PayPal item number (contains user_id)  | 
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| 326 | *  | 
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| 327 | * @return string  | 
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| 328 | * @access public  | 
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| 329 | */  | 
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| 330 | public function get_item_number()  | 
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| 334 | |||
| 335 | /**  | 
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| 336 | * Get PayPal currency name (eg: USD, EUR, etc.)  | 
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| 337 | *  | 
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| 338 | * @return string  | 
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| 339 | * @access public  | 
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| 340 | */  | 
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| 341 | public function get_mc_currency()  | 
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| 345 | |||
| 346 | /**  | 
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| 347 | * Get PayPal fees  | 
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| 348 | *  | 
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| 349 | * @return float  | 
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| 350 | * @access public  | 
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| 351 | */  | 
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| 352 | public function get_mc_fee()  | 
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| 356 | |||
| 357 | /**  | 
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| 358 | * Get PayPal amount  | 
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| 359 | * This is the amount of donation received before fees  | 
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| 360 | *  | 
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| 361 | * @return float  | 
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| 362 | * @access public  | 
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| 363 | */  | 
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| 364 | public function get_mc_gross()  | 
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| 368 | |||
| 369 | /**  | 
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| 370 | * Get Net amount  | 
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| 371 | * This is the amount of donation received after fees  | 
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| 372 | *  | 
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| 373 | * @return float  | 
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| 374 | * @access public  | 
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| 375 | */  | 
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| 376 | public function get_net_amount()  | 
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| 380 | |||
| 381 | /**  | 
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| 382 | * Get PayPal payment date  | 
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| 383 | *  | 
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| 384 | * @return integer  | 
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| 385 | * @access public  | 
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| 386 | */  | 
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| 387 | public function get_payment_date()  | 
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| 391 | |||
| 392 | /**  | 
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| 393 | * Get PayPal payment status  | 
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| 394 | *  | 
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| 395 | * @return string  | 
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| 396 | * @access public  | 
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| 397 | */  | 
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| 398 | public function get_payment_status()  | 
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| 402 | |||
| 403 | /**  | 
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| 404 | * Get PayPal payment type  | 
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| 405 | *  | 
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| 406 | * @return string  | 
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| 407 | * @access public  | 
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| 408 | */  | 
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| 409 | public function get_payment_type()  | 
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| 413 | |||
| 414 | /**  | 
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| 415 | * Get PayPal settle amount  | 
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| 416 | * This is in case or the currency of the Payer is not in the same currency of the Receiver  | 
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| 417 | *  | 
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| 418 | * @return float  | 
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| 419 | * @access public  | 
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| 420 | */  | 
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| 421 | public function get_settle_amount()  | 
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| 425 | |||
| 426 | /**  | 
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| 427 | * Get PayPal settle currency  | 
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| 428 | *  | 
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| 429 | * @return string  | 
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| 430 | * @access public  | 
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| 431 | */  | 
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| 432 | public function get_settle_currency()  | 
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| 436 | |||
| 437 | /**  | 
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| 438 | * Get PayPal exchange rate  | 
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| 439 | * This is when the donation don’t use the same currency defined by the receiver  | 
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| 440 | *  | 
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| 441 | * @return string  | 
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| 442 | * @access public  | 
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| 443 | */  | 
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| 444 | public function get_exchange_rate()  | 
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| 448 | |||
| 449 | /**  | 
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| 450 | * Set PayPal transaction id  | 
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| 451 | *  | 
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| 452 | * @param string $txn_id  | 
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| 453 | *  | 
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| 454 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 455 | * @access public  | 
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| 456 | */  | 
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| 457 | public function set_txn_id($txn_id)  | 
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| 463 | |||
| 464 | /**  | 
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| 465 | * Set PayPal receiver ID  | 
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| 466 | *  | 
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| 467 | * @param string $receiver_id  | 
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| 468 | *  | 
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| 469 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 470 | * @access public  | 
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| 471 | */  | 
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| 472 | public function set_receiver_id($receiver_id)  | 
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| 478 | |||
| 479 | /**  | 
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| 480 | * Set PayPal receiver e-mail  | 
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| 481 | *  | 
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| 482 | * @param string $receiver_email  | 
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| 483 | *  | 
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| 484 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 485 | * @access public  | 
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| 486 | */  | 
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| 487 | public function set_receiver_email($receiver_email)  | 
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| 493 | |||
| 494 | /**  | 
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| 495 | * Set PayPal receiver ID  | 
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| 496 | *  | 
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| 497 | * @param string $residence_country  | 
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| 498 | *  | 
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| 499 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 500 | * @access public  | 
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| 501 | */  | 
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| 502 | public function set_residence_country($residence_country)  | 
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| 508 | |||
| 509 | /**  | 
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| 510 | * Set PayPal business (same as receiver ID or receiver_email)  | 
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| 511 | *  | 
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| 512 | * @param string $business  | 
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| 513 | *  | 
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| 514 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 515 | * @access public  | 
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| 516 | */  | 
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| 517 | public function set_business($business)  | 
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| 523 | |||
| 524 | /**  | 
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| 525 | * Set PayPal transaction status  | 
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| 526 | *  | 
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| 527 | * @param bool $confirmed  | 
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| 528 | *  | 
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| 529 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 530 | * @access public  | 
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| 531 | */  | 
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| 532 | public function set_confirmed($confirmed)  | 
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| 538 | |||
| 539 | /**  | 
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| 540 | * Set Test IPN status  | 
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| 541 | *  | 
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| 542 | * @param bool $test_ipn  | 
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| 543 | *  | 
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| 544 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 545 | * @access public  | 
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| 546 | */  | 
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| 547 | public function set_test_ipn($test_ipn)  | 
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| 553 | |||
| 554 | /**  | 
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| 555 | * Set PayPal transaction type  | 
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| 556 | *  | 
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| 557 | * @param string $txn_type  | 
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| 558 | *  | 
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| 559 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 560 | * @access public  | 
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| 561 | */  | 
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| 562 | public function set_txn_type($txn_type)  | 
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| 568 | |||
| 569 | /**  | 
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| 570 | * Set PayPal parent transaction ID (in case of refund)  | 
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| 571 | *  | 
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| 572 | * @param string $parent_txn_id  | 
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| 573 | *  | 
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| 574 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 575 | * @access public  | 
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| 576 | */  | 
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| 577 | public function set_parent_txn_id($parent_txn_id)  | 
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| 583 | |||
| 584 | /**  | 
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| 585 | * Set PayPal payer e-mail  | 
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| 586 | *  | 
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| 587 | * @param string $payer_email  | 
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| 588 | *  | 
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| 589 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 590 | * @access public  | 
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| 591 | */  | 
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| 592 | public function set_payer_email($payer_email)  | 
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| 598 | |||
| 599 | /**  | 
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| 600 | * Set PayPal payer account ID  | 
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| 601 | *  | 
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| 602 | * @param string $payer_id  | 
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| 603 | *  | 
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| 604 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 605 | * @access public  | 
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| 606 | */  | 
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| 607 | public function set_payer_id($payer_id)  | 
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| 613 | |||
| 614 | /**  | 
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| 615 | * Set PayPal payer Status (such as unverified/verified)  | 
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| 616 | *  | 
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| 617 | * @param string $payer_status  | 
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| 618 | *  | 
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| 619 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 620 | * @access public  | 
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| 621 | */  | 
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| 622 | public function set_payer_status($payer_status)  | 
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| 628 | |||
| 629 | /**  | 
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| 630 | * Set PayPal payer first name  | 
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| 631 | *  | 
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| 632 | * @param string $first_name  | 
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| 633 | *  | 
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| 634 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 635 | * @access public  | 
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| 636 | */  | 
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| 637 | public function set_first_name($first_name)  | 
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| 643 | |||
| 644 | /**  | 
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| 645 | * Set PayPal payer last name  | 
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| 646 | *  | 
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| 647 | * @param string $last_name  | 
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| 648 | *  | 
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| 649 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 650 | * @access public  | 
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| 651 | */  | 
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| 652 | public function set_last_name($last_name)  | 
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| 658 | |||
| 659 | /**  | 
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| 660 | * Set member user_id  | 
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| 661 | *  | 
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| 662 | * @param integer $user_id  | 
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| 663 | *  | 
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| 664 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 665 | * @access public  | 
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| 666 | */  | 
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| 667 | public function set_user_id($user_id)  | 
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| 673 | |||
| 674 | /**  | 
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| 675 | * Set member username  | 
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| 676 | *  | 
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| 677 | * @param string $username  | 
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| 678 | *  | 
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| 679 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 680 | * @access public  | 
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| 681 | */  | 
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| 682 | public function set_username($username)  | 
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| 688 | |||
| 689 | /**  | 
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| 690 | * Set PayPal payer last name  | 
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| 691 | *  | 
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| 692 | * @param string $custom  | 
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| 693 | *  | 
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| 694 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 695 | * @access public  | 
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| 696 | */  | 
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| 697 | public function set_custom($custom)  | 
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| 703 | |||
| 704 | /**  | 
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| 705 | * Set PayPal item name  | 
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| 706 | *  | 
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| 707 | * @param string $item_name  | 
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| 708 | *  | 
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| 709 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 710 | * @access public  | 
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| 711 | */  | 
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| 712 | public function set_item_name($item_name)  | 
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| 718 | |||
| 719 | /**  | 
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| 720 | * Set PayPal item number (contains user_id)  | 
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| 721 | *  | 
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| 722 | * @param string $item_number  | 
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| 723 | *  | 
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| 724 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 725 | * @access public  | 
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| 726 | */  | 
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| 727 | public function set_item_number($item_number)  | 
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| 733 | |||
| 734 | /**  | 
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| 735 | * Set PayPal currency name (eg: USD, EUR, etc.)  | 
            ||
| 736 | *  | 
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| 737 | * @param string $mc_currency  | 
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| 738 | *  | 
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| 739 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 740 | * @access public  | 
            ||
| 741 | */  | 
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| 742 | public function set_mc_currency($mc_currency)  | 
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| 748 | |||
| 749 | /**  | 
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| 750 | * Set PayPal fees  | 
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| 751 | *  | 
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| 752 | * @param float $mc_fee  | 
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| 753 | *  | 
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| 754 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
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| 755 | * @access public  | 
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| 756 | */  | 
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| 757 | public function set_mc_fee($mc_fee)  | 
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| 763 | |||
| 764 | /**  | 
            ||
| 765 | * Set PayPal amount  | 
            ||
| 766 | * This is the amount of donation received before fees  | 
            ||
| 767 | *  | 
            ||
| 768 | * @param float $mc_gross  | 
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| 769 | *  | 
            ||
| 770 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
            ||
| 771 | * @access public  | 
            ||
| 772 | */  | 
            ||
| 773 | public function set_mc_gross($mc_gross)  | 
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| 779 | |||
| 780 | /**  | 
            ||
| 781 | * Set Net amount  | 
            ||
| 782 | * This is the amount of donation received after fees  | 
            ||
| 783 | *  | 
            ||
| 784 | * @param float $net_amount  | 
            ||
| 785 | *  | 
            ||
| 786 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
            ||
| 787 | * @access public  | 
            ||
| 788 | */  | 
            ||
| 789 | public function set_net_amount($net_amount)  | 
            ||
| 795 | |||
| 796 | /**  | 
            ||
| 797 | * Set PayPal payment date  | 
            ||
| 798 | *  | 
            ||
| 799 | * @param integer $payment_date  | 
            ||
| 800 | *  | 
            ||
| 801 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
            ||
| 802 | * @access public  | 
            ||
| 803 | */  | 
            ||
| 804 | public function set_payment_date($payment_date)  | 
            ||
| 810 | |||
| 811 | /**  | 
            ||
| 812 | * Set PayPal payment status  | 
            ||
| 813 | *  | 
            ||
| 814 | * @param string $payment_status  | 
            ||
| 815 | *  | 
            ||
| 816 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
            ||
| 817 | * @access public  | 
            ||
| 818 | */  | 
            ||
| 819 | public function set_payment_status($payment_status)  | 
            ||
| 825 | |||
| 826 | /**  | 
            ||
| 827 | * Set PayPal payment type  | 
            ||
| 828 | *  | 
            ||
| 829 | * @param string $payment_type  | 
            ||
| 830 | *  | 
            ||
| 831 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
            ||
| 832 | * @access public  | 
            ||
| 833 | */  | 
            ||
| 834 | public function set_payment_type($payment_type)  | 
            ||
| 840 | |||
| 841 | /**  | 
            ||
| 842 | * Set PayPal settle amount  | 
            ||
| 843 | * This is in case or the currency of the Payer is not in the same currency of the Receiver  | 
            ||
| 844 | *  | 
            ||
| 845 | * @param float $settle_amount  | 
            ||
| 846 | *  | 
            ||
| 847 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
            ||
| 848 | * @access public  | 
            ||
| 849 | */  | 
            ||
| 850 | public function set_settle_amount($settle_amount)  | 
            ||
| 856 | |||
| 857 | /**  | 
            ||
| 858 | * Set PayPal settle currency  | 
            ||
| 859 | *  | 
            ||
| 860 | * @param string $settle_currency  | 
            ||
| 861 | *  | 
            ||
| 862 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
            ||
| 863 | * @access public  | 
            ||
| 864 | */  | 
            ||
| 865 | public function set_settle_currency($settle_currency)  | 
            ||
| 871 | |||
| 872 | /**  | 
            ||
| 873 | * Set PayPal exchange rate  | 
            ||
| 874 | * This is when the donation don’t use the same currency defined by the receiver  | 
            ||
| 875 | *  | 
            ||
| 876 | * @param string $exchange_rate  | 
            ||
| 877 | *  | 
            ||
| 878 | * @return transactions $this object for chaining calls; load()->set()->save()  | 
            ||
| 879 | * @access public  | 
            ||
| 880 | */  | 
            ||
| 881 | public function set_exchange_rate($exchange_rate)  | 
            ||
| 887 | }  | 
            ||
| 888 | 
This check compares the return type specified in the
@returnannotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch.