Appendix A

Hash is signature rule used either to validate your requests to payment platform or to validate callback from payment platform to your system. It must be md5 encoded string calculated by rules below:

*hash is calculated by the formula: md5(strtoupper(strrev(email).CLIENT_PASS. strrev(substr(card_number,0,6).substr(card_number,-4))))

if parameter card_token is specified hash is calculated by the formula:

md5(strtoupper(strrev(email).CLIENT_PASS.strrev(card_token)))

** hash is calculated by the formula: md5(strtoupper(strrev(email).CLIENT_PASS. trans_id.strrev(substr(card_number,0,6).substr(card_number,-4))))