HTTP Status Codes {#pa-testing-http-status-codes}
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These HTTP status codes can appear during payer authentication.

201: AUTHENTICATION_FAILED
:
Encountered a payer authentication problem. Payer could not be authenticated.

201: CONSUMER_AUTHENTICATIION_REQUIRED
:
Encountered a payer authentication problem. Payer could not be authenticated.

400: CONSUMER_AUTHENTICATIION_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.