Cash App · Authentication Profile

Cash App Authentication

Authentication

Cash App secures its APIs with apiKey, http, and hmac-signature across 2 declared security schemes, as derived from its OpenAPI definitions.

Financial ServicesPaymentsUnited StatesFintechNeobankBuy Now Pay LaterPayment AcceptanceDigital WalletConsumer Finance

Methods: apiKey, http, hmac-signature Schemes: 2 OAuth flows: API key in: header

Security Schemes

cash-app-pay-signed-api-key apiKey+hmac

afterpay-basic http

scheme: basic

Source

Authentication Profile

generated: '2026-06-20'
method: searched
source: 'https://developers.cash.app/cash-app-pay-partner-api/guides/technical-guides/api-fundamentals/requests/using-api-keys

  https://developers.cash.app/cash-app-pay-partner-api/guides/technical-guides/api-fundamentals/requests/signing-requests

  https://developers.cash.app/afterpay/api-reference/reference/introduction/authentication

  '
docs: https://developers.cash.app/cash-app-pay-partner-api/guides/technical-guides/api-fundamentals/requests/using-api-keys
summary:
  types:
  - apiKey
  - http
  - hmac-signature
  api_key_in:
  - header
  oauth2_flows: []
schemes:
- name: cash-app-pay-signed-api-key
  applies_to:
  - Cash App Pay Network API (api.cash.app/network/v1)
  - Cash App Pay Management API (api.cash.app/management/v1)
  - Cash App Pay Customer Request API (api.cash.app/customer-request/v1)
  type: apiKey+hmac
  authorization_header: Client {CLIENT_ID} {KEY_ID}
  signature:
    header: X-Signature
    value_format: V1 {signature}
    algorithm: HMAC-SHA256
    signed_string: '{method}\n{path}\n{headers}\n{bodyDigest}'
    signed_headers:
    - Accept
    - Authorization
    - Content-Type
    - Host
    body_digest: hex(SHA256(body)) lowercased
    required_on:
    - Network API
    - Management API
  key_lifecycle:
    provisioning: automated via Management API create-api-key (scoped keys)
    bootstrap: client_id + client_secret used once to mint the first API_KEYS_READ/WRITE
      key
    expiry_days: 30
    expiry_field: expires_at
    rotation: recommended several days before expiry; multiple least-privilege keys
      advised
  sandbox:
    host: sandbox.api.cash.app
    signature_bypass: 'X-Signature: sandbox:skip-signature-check'
  notes: 'Not OAuth2. Cash App Pay uses signed, scoped API keys: the Authorization
    header carries the

    client ID and key ID, and Network/Management requests must also carry an HMAC-SHA256
    X-Signature

    computed with the key''s secret. Scopes (PAYMENTS_READ, API_KEYS_WRITE, ...) are
    attached per key;

    see scopes/cash-app-scopes.yml.

    '
- name: afterpay-basic
  applies_to:
  - Afterpay Global API (global-api.afterpay.com)
  type: http
  scheme: basic
  spec: RFC 7617
  credentials: merchantId (username) + secretKey (password)
  sources:
  - openapi/cash-app-payments-openapi.json
  - openapi/cash-app-checkouts-openapi.json
  - openapi/cash-app-disputes-openapi.json
  - openapi/cash-app-configuration-openapi.json
  - openapi/cash-app-orders-openapi.json
  - openapi/cash-app-grants-afterpay-openapi.json
  - openapi/cash-app-grants-cash-app-pay-openapi.json
  - openapi/cash-app-billing-agreements-deprecated-openapi.json
  note: 'Afterpay/Cash App Afterpay Global API uses HTTP Basic auth (declared as securityScheme
    sec0 in

    the harvested OpenAPI). All endpoints except /ping require it; failure returns
    401 Unauthorized.

    Afterpay docs note two supported auth options; Basic is the primary documented
    method.

    '
docs_all:
- https://developers.cash.app/cash-app-pay-partner-api/guides/technical-guides/api-fundamentals/requests/using-api-keys
- https://developers.cash.app/cash-app-pay-partner-api/guides/technical-guides/api-fundamentals/requests/signing-requests
- https://developers.cash.app/afterpay/api-reference/reference/introduction/authentication

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