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List of the ProcessPayment function parameters
| Parameter | Description | 
| merchant_id | The merchant identifier in IPS Assist | 
| amount | Payment amount, in original currency | 
| currency | Order currency | 
| ordernumber | Order number in the merchant payments system | 
| comment | Order comment | 
| Customer's e-mail | |
| firstname | Customer's first name | 
| lastname | Customer's last name | 
| middlename | Customer's middle name | 
The values may include field names of the completed payment form.
