| ⇢ | A | DataHelper added |
| ⇢ | A | DataHelper::validate_an() added | |
| ⇢ | A | DataHelper::validate_null_or_an() added | |
| ⇢ | A | Order::set_merchant_return_url() added | |
| ⇢ | A | Order::set_merchant_order_id() added | |
| ⇢ | A | Order::set_amount() added | |
| ⇢ | A | Money::get_signature_fields() added |