9. Error Scenarios and Status Codes

The error scenarios and corresponding status codes are listed in the tables below.

Scenario	Status code	Description
Invalid amount	51	For example, 0.01.
Missing mandatory request field	400	For example, element 'card': The attribute 'type-id' is required but missing.

Code	Description
2000 and 2001	Transaction successful.
2010	Transaction failed.
4021	Session failed; maximum attempts exceeded.
4030	Session successfully completed.
4031	Session partially completed.
4021	Session failed or declined.

Note: For details about status codes, refer to the CPD Velocity API Integration Guide- Status Codes.