Appendix A - Payment Transaction Response Codes

This appendix provides reference material regarding the codes that are returned in a cnpAPI response for a payment transaction. This appendix contains the following sections:

• Payment Transaction Response Codes

• 3DS Authentication Result Codes

• AVS Response Codes

• AAVS Response Codes

• Card Validation Response Codes

• A.2 - Advanced Fraud Tools Triggered Rules

• XML Validation Error Messages

• Additional Response Header Error Messages

• ACH Return Reason Codes

• ACH NoC Change Codes

• Canadian EFT Return Codes