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API versioning overview

Marmin API versioning is header based and controlled per request.

Use the request header X-MARMIN-VERSION to select which API contract should be applied.

Available versions

  • 20260101 (default)

  • 20260507 (latest)

How version selection works

  • If X-MARMIN-VERSION is not sent, the API uses 20260101.

  • If X-MARMIN-VERSION: 20260507 is sent, the API uses the latest contract.

  • Version selection is request scoped, so keep the same header value across related API calls in one workflow.

Header examples

Default behavior (header omitted):

POST /api/sales-invoices/{business_profile_id}
Authorization: Bearer <access_token>
Content-Type: application/json

Latest version behavior:

POST /api/sales-invoices/{business_profile_id}
Authorization: Bearer <access_token>
Content-Type: application/json
X-MARMIN-VERSION: 20260507
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