HTTP Status Codes
While payloads include Status/Message fields, use conventional HTTP status codes for transport semantics:
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200 OK: Successful operations (login success, form created, payment completed, details found)
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400 Bad Request: Validation failures or malformed input
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401 Unauthorized: Missing/invalid Bearer token for protected endpoints
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404 Not Found: Unknown resource or reference number
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409 Conflict: Idempotency conflicts or duplicate payment attempts