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The partner REST contract is public. No account, cookie or key is required to read it. Download api/openapi.yaml The document is the source of truth for paths, fields and availability. Each operation sets x-melso-status:
  • live: Melso runs it in production today. On the partner REST API that path is private beta: a key works once Melso enables your account.
  • preview: planned. Not callable yet.
x-melso-actor: person means a signed-in person decides. A partner key cannot make that call. The same contract is rendered, one operation per page, in the reference. Start with Authentication, Availability and Examples. The Spanish overview is API para Hacienda, Seguridad Social y Verifactu.