> ## Documentation Index
> Fetch the complete documentation index at: https://docs.aropay.aro.media/llms.txt
> Use this file to discover all available pages before exploring further.

# Get passkey login options

> Produce WebAuthn authentication options. Include `email` to scope the
challenge to one account, or omit it for usernameless login with
discoverable credentials. The challenge is bound to the client via a
signed, short-lived cookie that must accompany the subsequent
`POST /auth/passkey/verify`.




## OpenAPI

````yaml /api-reference/openapi.yaml post /auth/passkey/options
openapi: 3.1.0
info:
  title: AroPay API
  version: 1.0.0
  description: |
    The AroPay API for orchestrating sealed, private payments on public
    ledgers, built on the Aro Confidential Rails (Zama Protocol FHE). The
    current deployment is an MVP sandbox for B2B users on Ethereum Sepolia,
    with Mainnet to follow.

    Every response (except the flat Sandbox probes)
    uses the shared envelope: `{ "ok": true, "data": … }` on success and
    `{ "ok": false, "error": { "code", "message", "details?" } }` on failure.

    Amounts are decimal strings in human units (e.g. `"125.50"`). Write
    requests must send `Content-Type: application/json`.
  contact:
    name: Aro Media
    url: https://aro.media
servers:
  - url: https://aropay.aro.media/api/v1
    description: Sandbox
  - url: http://aropay.localhost:3000/api/v1
    description: Local development
security:
  - apiKeyAuth: []
  - sessionCookie: []
tags:
  - name: Auth
    description: Password, TOTP, and passkey login; session inspection and logout.
  - name: Profile & security
    description: Profile, password, two-factor authentication, and passkey management.
    x-group: Profile & security
  - name: API keys
    description: Programmatic credentials. Creation and revocation are session-only.
  - name: Wallets
    description: Custodial and external (watch-only) wallets.
  - name: Balances
    description: Balance triples and lightweight gas reads.
  - name: Money movement
    description: Faucet funding, minting, transfers, and redemptions.
  - name: Transactions
    description: History, single-transaction reads, and notarized receipts.
  - name: Sandbox
    description: Unauthenticated status and echo probes with a flat response shape.
paths:
  /auth/passkey/options:
    post:
      tags:
        - Auth
      summary: Get passkey login options
      description: |
        Produce WebAuthn authentication options. Include `email` to scope the
        challenge to one account, or omit it for usernameless login with
        discoverable credentials. The challenge is bound to the client via a
        signed, short-lived cookie that must accompany the subsequent
        `POST /auth/passkey/verify`.
      operationId: passkeyLoginOptions
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                email:
                  type: string
                  format: email
                  description: Optional. Omit for usernameless login.
            example:
              email: you@company.com
      responses:
        '200':
          description: WebAuthn request options; challenge cookie set.
          content:
            application/json:
              schema:
                type: object
                required:
                  - ok
                  - data
                properties:
                  ok:
                    const: true
                  data:
                    type: object
                    required:
                      - options
                    properties:
                      options:
                        type: object
                        description: >-
                          WebAuthn `PublicKeyCredentialRequestOptions` (pass to
                          `navigator.credentials.get`).
                        additionalProperties: true
        '400':
          $ref: '#/components/responses/BadRequest'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/InternalError'
      security: []
components:
  responses:
    BadRequest:
      description: Malformed body or failed validation.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            ok: false
            error:
              code: validation_error
              message: Request validation failed.
              details:
                - path: amount
                  message: Required
    RateLimited:
      description: Rate limit exceeded.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            ok: false
            error:
              code: rate_limited
              message: Too many requests. Try again shortly.
    InternalError:
      description: Unexpected server error.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            ok: false
            error:
              code: internal_error
              message: An unexpected error occurred.
  schemas:
    ErrorResponse:
      type: object
      description: The shared failure envelope.
      required:
        - ok
        - error
      properties:
        ok:
          const: false
        error:
          type: object
          required:
            - code
            - message
          properties:
            code:
              type: string
              description: Machine-readable error code; match on this, not `message`.
            message:
              type: string
            details:
              description: Structured context, e.g. per-field validation issues.
  securitySchemes:
    apiKeyAuth:
      type: http
      scheme: bearer
      bearerFormat: aro_sk_…
      description: |
        AroPay API key, sent as `Authorization: Bearer aro_sk_…`. Created in
        the dashboard under Settings → API keys. Takes precedence over a
        session cookie when both are present.
      x-default: aro_sk_your_key_here
    sessionCookie:
      type: apiKey
      in: cookie
      name: aropay_session
      description: |
        Browser session cookie minted by `POST /auth/login` (or passkey
        login). httpOnly, `SameSite=Lax`, 24 h TTL. Endpoints marked
        **Session-only** accept only this credential and return
        `403 session_required` for API keys.

````