generated: '2026-09-09'
method: derived
source: >-
  Derived from First Data's own First Data Gateway (IPG) client libraries —
  https://github.com/GBSEcom/Python docs/Error.md and the
  openapi_client/models/transaction_response.py,
  transaction_error_response.py, payment_schedules_response.py and
  payment_tokenization_response.py enumerations.
decline_code_count: 0
note: >-
  This is a payments/authorization provider, so the artifact is in scope — but the
  decline-code REGISTRY is not published anywhere reachable. What First Data does
  publish, in its own generated SDKs, is the envelope field that carries the code
  and the closed set of transaction result/state values that classify the outcome.
  Those are recorded below. No decline code has been invented to fill the list; an
  honest zero is the measurement.
envelope:
  decline_field: error.declineReasonCode
  decline_field_description: Information about the decline reason.
  http_status_on_decline: 422
  http_status_description: The processor declined the transaction.
  companion_fields: [error.code, error.message, apiTraceId]
transaction_result_states:
  description: >-
    Closed enumeration of transactionResult / transactionStatus values published in
    the SDK models. These classify an outcome; they are not decline reason codes.
  transaction_result: [APPROVED, WAITING, PARTIAL, VALIDATION_FAILED, PROCESSING_FAILED, DECLINED]
  transaction_state: [AUTHORIZED, CAPTURED, DECLINED, CHECKED, COMPLETED_GET, INITIALIZED, PENDING, READY, TEMPLATE, SETTLED, VOIDED, WAITING]
  payment_schedule_result: [SUCCESS, VALIDATION_FAILED, PROCESSING_FAILED, FAILURE, DECLINED]
  tokenization_result: [DELETED, FAILED, SUCCESS, APPROVED, WAITING, VALIDATION_FAILED, DECLINED]
decline_codes: []
masked_to_buyer: unknown
gaps:
  - >-
    The decline-reason-code reference is behind the merchant-boarded documentation
    on developer.fiserv.com, which renders client-side and returns an identical
    6,217-byte SPA shell for every path — including paths that cannot exist — so
    no code table could be read.