generated: '2026-07-24'
method: searched
source: https://developers.worldfirst.com/docs/alipay-worldfirst/cashier_payment/getting_started
docs: https://developers.worldfirst.com/docs/alipay-worldfirst/overview/apis
note: >-
  WorldFirst does not publish a downloadable OpenAPI, so this profile is captured
  from the developer documentation rather than derived from a spec. The gateway is
  Ant Group's Antom-style platform (open-sea/open-eu/open-na hosts, /amsin/api/v1
  paths). Every request is authenticated with an asymmetric digital signature; an
  OAuth 2.0 access token is additionally used on the Enterprise Solution.
summary:
  types: [signature, oauth2]
  signature_algorithms: [RSA256, ECC224]
  api_key_in: [header]
  oauth2_flows: [clientCredentials]
schemes:
- name: RequestSignature
  type: signature
  scheme: RSA256
  in: header
  header: Signature
  format: "algorithm=RSA256,keyVersion=1,signature=<base64(sign(content))>"
  signed_content: "<HTTP-METHOD> <request-URI>\n<Client-Id>.<request-time>.<request-body>"
  key_management: >-
    Partner generates an RSA (or ECC) key pair and uploads the public key in the
    Developer Center Key Management section (separately for sandbox and production).
    WorldFirst signs its asynchronous notifications so the partner verifies them
    with WorldFirst's public key.
  required_headers:
  - Client-Id        # merchant/partner identifier issued in the Developer Center
  - Signature        # RSA256/ECC224 signature over the canonical request
  - request-time     # request timestamp (replay protection)
  - Content-Type     # application/json
  sources: [docs: cashier_payment/getting_started]
- name: OAuth2AccessToken
  type: oauth2
  scheme: bearer
  description: >-
    The Enterprise Solution (World Account) additionally carries an OAuth 2.0
    Access-Token obtained through partner authorization; the Pay Solution (Cashier
    Payment) is signature-only. Scopes are not published in the public docs.
  sources: [docs: worldfirst_enterprise_solution/api_overview]
alternatives:
  ecc224: >-
    ECC224 is supported as an alternative to RSA256 for the request signature; the
    Signature header algorithm token changes accordingly (algorithm=ECC224,...).