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

# Didit webhook (server to server, not for the app)

> Checks X-Signature (HMAC-SHA256 of the raw body with the webhook secret) and X-Timestamp (±5 min). On Approved, reads the document from Didit's decision endpoint and issues the card.



## OpenAPI

````yaml https://api.tozzecard.xyz/openapi.json post /kyc/didit
openapi: 3.1.0
info:
  title: Tozzecard API
  version: 1.0.0
  description: >-
    Backend for the Tozzecard app: card sign-in, card face and statement, agent
    strategy, portfolio, agent feed, market hours and the demo B402 merchant.


    **Sign in with the card key** (the EOA the browser unlocks with the
    passkey):

    1. `POST /auth/challenge {address}` → `{message}`

    2. `account.signMessage({ message })` (viem)

    3. `POST /auth/verify {message, signature}` → `{token, address, kyc, card}`.

    4. Send `Authorization: Bearer <token>` on `/me*`, `/kyc/session` and `PUT
    /strategy`. Tokens last 30 days.


    **Activating the card** (identity check with Didit): while `kyc` is not
    `approved`, `card` is null. `POST /kyc/session {returnUrl?}` → `{url}`; open
    it; Didit sends the user back to `returnUrl`; poll `GET /me` while `kyc` is
    `pending`. On approval the card is issued with the holder name from the
    document.


    **Paying a merchant order** (B402 / x402 v2): `GET
    /merchant/orders/{id}/pay` → 402 with `accepts[0]`; build and sign with
    `@tozzecard/binance/eip3009` (`transferAuthorization`, `signTypedData`,
    `paymentHeader`); `POST` the same URL with header `PAYMENT-SIGNATURE`. The
    receipt comes back in `PAYMENT-RESPONSE`.


    Errors are `{error, code?}`. Amounts in USD are numbers; on-chain amounts
    are decimal strings.
servers:
  - url: https://api.tozzecard.xyz
    description: VPS (BSC mainnet)
  - url: http://localhost:8787
    description: Local
security: []
tags:
  - name: Card
    description: Sign-in and the card itself
  - name: Agent
    description: Strategy, portfolio and the agent's decisions
  - name: Market
    description: US market hours and tokenized stock prices
  - name: Merchant
    description: Demo merchant accepting USD1 through B402
  - name: System
paths:
  /kyc/didit:
    post:
      tags:
        - Card
      summary: Didit webhook (server to server, not for the app)
      description: >-
        Checks X-Signature (HMAC-SHA256 of the raw body with the webhook secret)
        and X-Timestamp (±5 min). On Approved, reads the document from Didit's
        decision endpoint and issues the card.
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  kyc:
                    $ref: '#/components/schemas/Kyc'
        '401':
          description: Bad signature
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '503':
          description: Identity check not configured
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Kyc:
      enum:
        - none
        - pending
        - approved
        - declined
        - duplicate
      description: >-
        Identity check. none: not started (or abandoned/expired, start again);
        pending: in Didit or in review; declined: refused (may retry);
        duplicate: this document already holds another card.
    Error:
      type: object
      required:
        - error
      properties:
        error:
          type: string
        code:
          type: string

````

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