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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 choose which API contract version is applied.

Available versions

  • 20260101 (default)

  • 20260507 (latest)

How version selection works

  • If X-MARMIN-VERSION is not sent, requests run on 20260101.

  • Existing integrations remain compatible with no header changes.

  • To migrate, send X-MARMIN-VERSION: 20260507 and validate request payload compatibility.

Header examples

Current default contract:

X-MARMIN-VERSION: 20260101

Opt in to latest contract:

X-MARMIN-VERSION: 20260507
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