generated: '2026-10-09'
method: searched
source: https://developers.karbonhq.com/guides/authentication/
docs: https://developers.karbonhq.com/guides/authentication/
summary:
  types:
  - apiKey
  - http
  api_key_in:
  - header
  both_required: true
  note: Every request must carry BOTH the Authorization bearer token (the Application ID) and the AccessKey header. The docs state the Authorization token is "a 36 character long GUID" and the AccessKey "is a JWT"; the OpenAPI marks BearerAuth bearerFormat JWT, which disagrees with the docs.
schemes:
- name: BearerAuth
  type: http
  scheme: bearer
  bearerFormat: JWT
  header: Authorization
  format_per_docs: "Bearer {token} — a 36 character long GUID"
  description: The Application ID for your API application, supplied by secure message when your Application is first registered
  sources:
  - openapi/karbonhq-openapi.yml
  - https://developers.karbonhq.com/guides/authentication/
- name: ApiKeyAuth
  type: apiKey
  in: header
  parameter: AccessKey
  format_per_docs: JWT (starts with eyJ...)
  description: The AccessKey for your API application, found inside the Settings > Connected Apps section in Karbon
  sources:
  - openapi/karbonhq-openapi.yml
  - https://developers.karbonhq.com/guides/authentication/
provisioning: "Karbon UI → Settings → Connected Apps → API Applications → your application"
access_restrictions: "Access is restricted to Business and Enterprise plan customers; firms are limited to one API application per account. (developers.karbonhq.com/llms.txt)"
rotation: "Rotating your Access Key immediately invalidates the previous key."
errors:
- status: 401
  meaning: Missing or invalid `Authorization` header or `AccessKey`
base_url: https://api.karbonhq.com