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Reason Codes {#uc-appendix-reason-codes}
========================================

A `Unified Checkout` request response returns one of the following reason codes:

| Reason Code | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|:------------|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `200`       | Successful response.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| `201`       | Capture context created.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| `400`       | Bad request. Possible reason values: * `CAPTURE_CONTEXT_EXPIRED` * `CAPTURE_CONTEXT_INVALID` * `CHECKOUT_ERROR` * `CLICK_TO_PAY_SDK_LOAD_ERROR` * `COMPLETE_AUTHENTICATION_CANCELED` * `COMPLETE_AUTHENTICATION_FAILED` * `COMPLETE_ERROR` * `COMPLETE_IN_PROGRESS` * `COMPLETE_NOT_ALLOWED` * `COMPLETE_TRANSACTION_CANCELLED` * `COMPLETE_TRANSACTION_FAILED` * `COMPLETE_VALIDATION_ERROR` * `CREATE_TOKEN_TIMEOUT` * `CREATE_TOKEN_XHR_ERROR` * `ENCRYPT_CARD_FOR_SRC_ENROLMENT_ERROR` * `GOOGLEPAY_CHECKOUT_ERROR` * `INVALID_APIKEY` * `LAUNCH_SRC_CHECKOUT_ERROR` * `SDK_XHR_ERROR` * `SHOW_LOAD_CONTAINER_SELECTOR` * `SHOW_LOAD_ERROR` * `SHOW_LOAD_INVALID_CONTAINER` * `SHOW_LOAD_SIDEBAR_OPTIONS` * `SHOW_PAYMENT_TIMEOUT` * `SHOW_PAYMENT_UNAVAILABLE` * `SHOW_TOKEN_TIMEOUT` * `SHOW_TOKEN_XHR_ERROR` * `TOKENIZATION_ERROR` * `TRIGGER_PAYMENT_TYPE_NOT_SUPPORTED` * `UNIFIED_PAYMENTS_ALREADY_SHOWN` * `UNIFIED_PAYMENTS_PAYMENT_PARAMETERS` * `UNIFIED_PAYMENTS_VALIDATION_FIELDS` * `UNIFIED_PAYMENTS_VALIDATION_PARAMS` |
| `404`       | The specified resource not found in the system.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| `500`       | Unexpected server error.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
[Reason Codes]