BILL · Authentication Profile

Bill Authentication

Authentication

BILL secures its APIs with apiKey across 1 declared security scheme, as derived from its OpenAPI definitions.

Accounts PayableAccounts ReceivableSpend ManagementExpense ManagementPaymentsBill PayFinancial OperationsFintech
Methods: apiKey Schemes: 1 OAuth flows: API key in: header

Security Schemes

sessionAuth apiKey
· in: header (sessionId)

Source

Authentication Profile

Raw ↑ 
generated: '2026-07-11'
method: derived
source: openapi/bill-openapi.yml
summary:
  types:
  - apiKey
  api_key_in:
  - header
schemes:
- name: sessionAuth
  type: apiKey
  in: header
  parameter: sessionId
  description: |-
    Session identifier obtained from `POST /login`. Expires after 35 minutes
    of inactivity. A `devKey` (developer key) is also required on requests
    and is sent alongside `sessionId` in the appropriate header per BILL's
    official reference.
  sources:
  - openapi/bill-openapi.yml