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Verification of Payment Notification Authenticity

The merchant must verify the integrity of data received on pages: Success, Result and Fail in order to verify that no data tampering took place. To verify the integrity of data, the merchant must compare the data from the request with the real data that can be received from the web service https://www.paymer.com/merchant/Service/Service0.asmx or by sending the POST/GET request https://www.paymer.com/merchant/service/PMerchService.aspx

More about SOAP method and POST/GET method.