Fifth Third Bancorp Authentication

generated: '2026-07-23'
method: searched
source: openapi/newline-platform-api.json
docs: https://developers.newline53.com/docs/api-authentication
docs_pages:
  - https://developers.newline53.com/docs/authentication-guide
  - https://developers.newline53.com/docs/api-authentication
  - https://developers.newline53.com/docs/authorization-guide
  - https://developers.newline53.com/docs/sdk-authentication
summary:
  types:
    - apiKey
  api_key_in:
    - header
  oauth2_flows: []
model: jws-hmac-bearer
notes: >-
  The Newline Platform API uses a JWT/JWS-based bearer strategy. A client
  exchanges a refresh token for an access token by POSTing to /auth a JWS whose
  payload carries the Program UID (sub) and current epoch time (iat), signed
  with a previously shared HMAC secret using HS512. The returned access token
  (prefixed "auth-") is valid up to 8 hours and is supplied in the Authorization
  header of every subsequent request. The sandbox uses an identical token
  strategy to production. HMAC secrets/Program IDs are provisioned by the
  Newline Relationship team over secure email (no self-service signup at this time).
schemes:
  - name: ApiKeyAuth
    type: apiKey
    in: header
    parameter: Authorization
    description: >-
      Access token (auth- prefixed) obtained from POST /auth by signing a JWS
      with the shared HMAC (HS512); supplied in the Authorization header.
    sources:
      - openapi/newline-platform-api.json
signing:
  algorithm: HS512
  jws_payload:
    sub: Program UID
    iat: current epoch time
  token_prefix: auth-
  token_ttl: up to 8 hours
provisioning: Relationship-team issued (secure email); no self-service signup