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Every request carries a bearer token:
There is no tenant or workspace header. The token identifies the workspace.

Token format

The . matters: both halves are base64url, whose alphabet includes _, so splitting on anything else truncates some tokens. Send the string exactly as issued. Tokens from non-production environments are prefixed sk_test_ instead. Only the selector is stored. The verifier is hashed, so a lost token cannot be recovered — ask a workspace administrator to create a replacement and revoke the old one. Revocation takes effect immediately, not at the end of a cache window.

Scopes

A scope is <resource>:<access>. read covers list and retrieve; write covers create, update, and delete. Ask for the narrowest set that does your job. Calling an endpoint without its scope returns 403 insufficient_scope, and the message names the scopes you are missing.
Scopes intersect with what your workspace is allowed to do — they never grant beyond it. A token with deals:write still cannot write deals in a workspace whose deals are mirrored from an external CRM. Call GET /v1/capabilities to see the effective policy per entity before you attempt a write.

Two limits worth knowing up front

A token reads the whole workspace. Sailer’s per-user record visibility rules apply to people, not tokens — a token has no user behind it. Anything in the workspace is readable with the right scope, regardless of who owns the record. Treat a token as workspace-wide access and scope it accordingly. Write policy still applies. If a workspace mirrors an entity from an external CRM, writes to that entity are rejected for everyone, tokens included. This is deliberate: it stops the API from silently diverging from the system of record. GET /v1/capabilities reports which entities you may write.

Keeping tokens safe

  • Server-side only. A token in browser or mobile code is a workspace-wide leak.
  • Environment variables or a secret manager, never source control.
  • One token per integration, so you can revoke one without breaking the others.
  • Tell us immediately if one leaks and we will revoke it.