Versioning

Breaking changes ship as dated versions, selected with the Flashline-Version header.

Required on API resource requests. Send Flashline-Version with the version you built against on every call to /api/me, /api/measurements and any future resource. Requests without it get 400. The OAuth endpoints under /api/oauth do not take it.

Breaking changes get a new version. Removing or renaming a field, changing a type, or making optional input required. Backward-compatible additions do not: new optional fields or enum values may appear without a new version.

Support. Flashline supports a version for at least 12 months after its replacement is released.

Versions

These docs describe the current version. Each row lists what changed for callers on the previous one.

Version	Status	Changes
2026-09-02	Current	Initial release.

Every API resource request

curl https://www.flashlinegutters.com/api/me \
  -H "Authorization: Bearer flt_…" \
  -H "Flashline-Version: 2026-09-02"