generated: '2026-07-21'
method: searched
source: https://gw.vipapis.com/ (live gateway error) + https://vop.vip.com/apicenter (Error Code Query Tool)
format: vendor-envelope
envelope:
  shape: '{ "returnCode": "<namespaced-code>", "returnMessage": "<human message>" }'
  code_field: returnCode
  message_field: returnMessage
  code_namespace: 'vipapis.*'
  content_type: application/json
lookup_tool: https://vop.vip.com/apicenter
errors:
  - code: vipapis.miss-parameter
    message: The service field is empty!
    cause: A required system parameter (here, the service field) was omitted from the request.
    remediation: Supply the required service parameter (and other system parameters) on every gateway call.
    source: live https://gw.vipapis.com/ response, 2026-07-21
notes: >-
  VOP returns a namespaced returnCode + returnMessage envelope rather than RFC 9457
  problem+json. Only the vipapis.miss-parameter code is captured verbatim from the live
  gateway; the complete code registry is behind the login-gated Error Code Query Tool and
  is not fabricated here. This is the non-payments error registry (VOP is not a card acquirer,
  so no decline-codes artifact applies).