Status and Reason Codes

HTTP Status Codes

These HTTP status codes can appear during payer authentication.

Code	Description
`201: AUTHENTICATION_FAILED`	Encountered a payer authentication problem. Payer could not be authenticated.
`201: CONSUMER_AUTHENTICATION_REQUIRED`	Encountered a payer authentication problem. Payer could not be authenticated.
`400: CONSUMER_AUTHENTICATION_FAILED`	Encountered a payer authentication problem. Payer could not be authenticated.
`400: INVALID_DATA`	Declined: One or more fields in the request contain invalid data.
`400: INVALID_MERCHANT_CONFIGURATION`	Declined: There is a problem with your merchant configuration.
`400: MISSING_FIELD`	Declined: The request is missing one or more fields.
`502: SYSTEM_ERROR`	Error: General system failure. A system error occurred.
`502: SYSTEM_TIMEOUT`	Error: The request was received but a server timeout occurred. This error does not include timeouts between the client and the server.
`502: SYSTEM_TIMEOUT`	Error: The request was received, but a service did not finish running in time.

Reason Codes

These reason codes can appear during payer authentication transactions. For a complete list of reason codes, go to Reason Codes for the Simple Order API.

Reason Code	Description
`100`	Transaction was successful.
`101`	The request is missing one or more required fields. Possible action: See the response fields missingField_0 through missingField_N for the missing fields. Possible action: Resend the request with the complete information.
`102`	One or more fields in the request contains invalid data. Possible action: See the response fields invalidField_0 through invalidField_N for the invalid fields. Possible action: Resend the request with the correct information.
`150`	Error: General system failure. Possible action: Wait a few minutes and resend the request.
`151`	Error: The request was received, but a server time-out occurred. This error does not include time-outs between the client and the server. Possible action: Wait a few minutes and resend the request.
`152`	Error: The request was received, but a service time-out occurred. Possible action: Wait a few minutes and resend the request.
`234`	A problem exists with your merchant configuration. Possible action: Do not resend the request. Contact customer support to correct the configuration problem.
`261`	The merchant account set up is either invalid or missing on the acquirer's gateway. Possible action: Check the merchant account configuration.
`465`	Encountered a Payer Authentication problem. Payer could not be authenticated. Possible action: Authenticate the cardholder before continuing with the transaction.
`475`	The cardholder is enrolled in Payer Authentication. Possible action: Authenticate the cardholder before continuing with the transaction.
`476`	Payer could not be authenticated. Possible action: Authenticate the cardholder before continuing with the transaction.
`478`	Strong customer authentication (SCA) is required for this transaction.

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Last published: September 29, 2026