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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * RoboKassa driver for the Omnipay PHP payment processing library  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link      https://github.com/hiqdev/omnipay-epayservice  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package   omnipay-epayservice  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license   MIT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright Copyright (c) 2015-2016, HiQDev (http://hiqdev.com/)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Omnipay\RoboKassa\Message;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class PurchaseRequest extends AbstractRequest  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getCurrency()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getParameter('currency'); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function setCurrency($value)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->setParameter('currency', $value); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function getLanguage()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getParameter('language'); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function setLanguage($value)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->setParameter('language', $value); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function getSignatureValue()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getParameter('signature'); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function setSignatureValue($value)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->setParameter('signature', $value); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function getData()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->validate(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'purse',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'amount', 'currency', 'description',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'returnUrl', 'cancelUrl', 'notifyUrl'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Desc' => $this->getDescription(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'MrchLogin' => $this->getPurse(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'OutSum' => $this->getAmount(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'IncCurrLabel' => $this->getCurrency(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Culture' => $this->getLanguage(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'ShpCart' => $this->is_cart,  | 
            
                            
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                            'ShpClient' => $this->client,  | 
            
                            
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                            'ShpTime' => $this->time,  | 
            
                            
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                            'SignatureValue' => $this->getSignatureValue(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function sendData($data)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->response = new PurchaseResponse($this, $data);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: