WeChat Pay APIv3 (Direct-Connect Merchant)

asyncapi: 2.6.0

info:
  title: WeChat Webhooks (Official Accounts, WeChat Pay APIv3, WeCom)
  version: 1.0.0
  description: |
    AsyncAPI description of the publicly documented WeChat (Weixin) webhook
    surfaces. WeChat does not expose a public WebSocket / streaming endpoint
    for third-party developers — its event-driven surface is delivered as
    HTTP POST callbacks ("server push" / "message push" / "payment
    notification") to URLs that developers register in the relevant WeChat
    console.

    This document models three of WeChat's documented callback surfaces:

    1. **WeChat Official Accounts message and event push** (Service Account
       and Subscription Account). Posts XML payloads to the URL configured
       in `mp.weixin.qq.com -> Settings & Development -> Basic
       configuration -> Server configuration`. Authenticity is established
       by a `signature` / `timestamp` / `nonce` query-string verification
       against the configured `Token`, with optional AES message encryption
       (`encrypt_type=aes`).

    2. **WeChat Pay APIv3 merchant notifications**. Posts JSON payloads to
       the `notify_url` registered when the merchant placed the order.
       Bodies are encrypted with AES-256-GCM using the merchant's APIv3
       key, and the request is signed with `Wechatpay-Signature`,
       `Wechatpay-Timestamp`, `Wechatpay-Nonce`, and `Wechatpay-Serial`
       headers tied to the WeChat Pay platform certificate.

    3. **WeChat Work (WeCom) message and event callbacks**. Posts XML
       payloads to the URL configured for each WeCom app, secured by the
       same `signature` / `timestamp` / `nonce` verification scheme used
       by Official Accounts, and using AES message encryption based on
       the app's `EncodingAESKey`.

    Only events that are explicitly documented in Tencent's WeChat / WeChat
    Pay / WeCom developer documentation are included.
  contact:
    name: WeChat Developer Community
    url: https://developers.weixin.qq.com/community/
  license:
    name: Proprietary

servers:
  officialAccountCallback:
    url: https://{yourDomain}{callbackPath}
    protocol: https
    description: |
      The HTTPS URL configured for an Official Account at
      `mp.weixin.qq.com -> Settings & Development -> Basic configuration ->
      Server configuration`. WeChat servers POST message and event push
      XML payloads to this endpoint.
    variables:
      yourDomain:
        description: The domain of the URL configured as the Official Account callback URL.
        default: example.com
      callbackPath:
        description: Path component of the configured callback URL.
        default: /wechat/officialaccount
    security:
      - officialAccountSignature: []

  wechatPayCallback:
    url: https://{yourDomain}{notifyPath}
    protocol: https
    description: |
      The HTTPS URL provided as `notify_url` when the merchant placed an
      order via WeChat Pay APIv3. WeChat Pay POSTs JSON payment / refund
      notifications to this endpoint.
    variables:
      yourDomain:
        description: The domain of the URL registered as `notify_url`.
        default: example.com
      notifyPath:
        description: Path component of the `notify_url`.
        default: /wechatpay/notify
    security:
      - wechatPaySignature: []

  wecomCallback:
    url: https://{yourDomain}{callbackPath}
    protocol: https
    description: |
      The HTTPS URL configured for a WeChat Work (WeCom) self-built app
      at `work.weixin.qq.com -> Application Management -> <app> -> Receive
      Messages -> URL`. WeCom servers POST message and event XML payloads
      to this endpoint.
    variables:
      yourDomain:
        description: The domain of the URL configured as the WeCom app callback URL.
        default: example.com
      callbackPath:
        description: Path component of the configured WeCom callback URL.
        default: /wecom/callback
    security:
      - wecomSignature: []

defaultContentType: application/xml

channels:
  # ---------------------------------------------------------------------------
  # WeChat Official Accounts — ordinary message push
  # https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Receiving_standard_messages.html
  # ---------------------------------------------------------------------------
  officialaccount/message/text:
    description: |
      A follower sent a text message to the Official Account.
    publish:
      operationId: receiveOfficialAccountTextMessage
      summary: Receive a text message from a follower.
      message:
        $ref: '#/components/messages/OfficialAccountTextMessage'

  officialaccount/message/image:
    description: |
      A follower sent an image message to the Official Account.
    publish:
      operationId: receiveOfficialAccountImageMessage
      summary: Receive an image message from a follower.
      message:
        $ref: '#/components/messages/OfficialAccountImageMessage'

  officialaccount/message/voice:
    description: |
      A follower sent a voice message to the Official Account.
    publish:
      operationId: receiveOfficialAccountVoiceMessage
      summary: Receive a voice message from a follower.
      message:
        $ref: '#/components/messages/OfficialAccountVoiceMessage'

  officialaccount/message/video:
    description: |
      A follower sent a video message to the Official Account.
    publish:
      operationId: receiveOfficialAccountVideoMessage
      summary: Receive a video message from a follower.
      message:
        $ref: '#/components/messages/OfficialAccountVideoMessage'

  officialaccount/message/shortvideo:
    description: |
      A follower sent a short video message to the Official Account.
    publish:
      operationId: receiveOfficialAccountShortVideoMessage
      summary: Receive a short video message from a follower.
      message:
        $ref: '#/components/messages/OfficialAccountShortVideoMessage'

  officialaccount/message/location:
    description: |
      A follower sent a location message to the Official Account.
    publish:
      operationId: receiveOfficialAccountLocationMessage
      summary: Receive a location message from a follower.
      message:
        $ref: '#/components/messages/OfficialAccountLocationMessage'

  officialaccount/message/link:
    description: |
      A follower sent a link message to the Official Account.
    publish:
      operationId: receiveOfficialAccountLinkMessage
      summary: Receive a link message from a follower.
      message:
        $ref: '#/components/messages/OfficialAccountLinkMessage'

  # ---------------------------------------------------------------------------
  # WeChat Official Accounts — event push
  # https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Receiving_event_pushes.html
  # ---------------------------------------------------------------------------
  officialaccount/event/subscribe:
    description: |
      A user subscribed to the Official Account, or scanned a parameter
      QR code while not yet subscribed.
    publish:
      operationId: receiveOfficialAccountSubscribeEvent
      summary: Receive a subscribe event.
      message:
        $ref: '#/components/messages/OfficialAccountSubscribeEvent'

  officialaccount/event/unsubscribe:
    description: |
      A user unsubscribed from the Official Account.
    publish:
      operationId: receiveOfficialAccountUnsubscribeEvent
      summary: Receive an unsubscribe event.
      message:
        $ref: '#/components/messages/OfficialAccountUnsubscribeEvent'

  officialaccount/event/scan:
    description: |
      An already-subscribed user scanned a parameter QR code generated
      by the Official Account.
    publish:
      operationId: receiveOfficialAccountScanEvent
      summary: Receive a SCAN event from a subscribed user.
      message:
        $ref: '#/components/messages/OfficialAccountScanEvent'

  officialaccount/event/location:
    description: |
      A follower reported their location (after enabling reporting in
      the Official Account "geolocation report" setting).
    publish:
      operationId: receiveOfficialAccountLocationEvent
      summary: Receive a LOCATION event.
      message:
        $ref: '#/components/messages/OfficialAccountLocationEvent'

  officialaccount/event/menu/click:
    description: |
      A follower tapped a CLICK-type item in the Official Account's
      custom menu.
    publish:
      operationId: receiveOfficialAccountMenuClickEvent
      summary: Receive a CLICK menu event.
      message:
        $ref: '#/components/messages/OfficialAccountMenuClickEvent'

  officialaccount/event/menu/view:
    description: |
      A follower tapped a VIEW-type item in the Official Account's
      custom menu (a URL link).
    publish:
      operationId: receiveOfficialAccountMenuViewEvent
      summary: Receive a VIEW menu event.
      message:
        $ref: '#/components/messages/OfficialAccountMenuViewEvent'

  officialaccount/event/templatemessage/finish:
    description: |
      Asynchronous delivery result for a template message that was sent
      via the Official Account template message API.
    publish:
      operationId: receiveOfficialAccountTemplateSendJobFinishEvent
      summary: Receive a TEMPLATESENDJOBFINISH event.
      message:
        $ref: '#/components/messages/OfficialAccountTemplateSendJobFinishEvent'

  # ---------------------------------------------------------------------------
  # WeChat Pay APIv3 — merchant notifications
  # https://pay.weixin.qq.com/wiki/doc/apiv3/en/index.shtml
  # ---------------------------------------------------------------------------
  wechatpay/transaction/success:
    description: |
      WeChat Pay successfully processed a payment for an order placed by
      the merchant. The encrypted resource decrypts to a Transaction
      object with `trade_state=SUCCESS`.
    publish:
      operationId: receiveWechatPayTransactionSuccess
      summary: Receive a payment success notification.
      message:
        $ref: '#/components/messages/WechatPayTransactionSuccessNotification'

  wechatpay/refund/success:
    description: |
      WeChat Pay completed processing a refund initiated by the merchant.
      The encrypted resource decrypts to a Refund object whose status
      indicates the final refund outcome.
    publish:
      operationId: receiveWechatPayRefundSuccess
      summary: Receive a refund result notification.
      message:
        $ref: '#/components/messages/WechatPayRefundNotification'

  # ---------------------------------------------------------------------------
  # WeChat Work (WeCom) — message and event callbacks
  # https://developer.work.weixin.qq.com/document/path/90930
  # https://developer.work.weixin.qq.com/document/path/90240
  # ---------------------------------------------------------------------------
  wecom/message/text:
    description: |
      A WeCom member sent a text message to a self-built app.
    publish:
      operationId: receiveWecomTextMessage
      summary: Receive a WeCom text message.
      message:
        $ref: '#/components/messages/WecomTextMessage'

  wecom/event/subscribe:
    description: |
      A WeCom member followed / was added to a self-built app's visible
      range.
    publish:
      operationId: receiveWecomSubscribeEvent
      summary: Receive a WeCom subscribe event.
      message:
        $ref: '#/components/messages/WecomSubscribeEvent'

  wecom/event/unsubscribe:
    description: |
      A WeCom member unfollowed / was removed from a self-built app's
      visible range.
    publish:
      operationId: receiveWecomUnsubscribeEvent
      summary: Receive a WeCom unsubscribe event.
      message:
        $ref: '#/components/messages/WecomUnsubscribeEvent'

  wecom/event/menu/click:
    description: |
      A WeCom member tapped a CLICK-type item in a self-built app's
      custom menu.
    publish:
      operationId: receiveWecomMenuClickEvent
      summary: Receive a WeCom CLICK menu event.
      message:
        $ref: '#/components/messages/WecomMenuClickEvent'

components:
  securitySchemes:
    officialAccountSignature:
      type: httpApiKey
      name: signature
      in: query
      description: |
        SHA-1 hash of the sorted concatenation of the configured Token,
        `timestamp`, and `nonce`. Sent as the `signature` query parameter
        on every message/event push from WeChat to the Official Account
        callback URL. Used together with the `timestamp` and `nonce`
        query parameters to verify the request originated from WeChat.

    wechatPaySignature:
      type: httpApiKey
      name: Wechatpay-Signature
      in: header
      description: |
        SHA256-with-RSA signature, encoded as Base64, of the canonical
        request derived from `Wechatpay-Timestamp`, `Wechatpay-Nonce`,
        and the request body, computed with the WeChat Pay platform
        certificate identified by `Wechatpay-Serial`.

    wecomSignature:
      type: httpApiKey
      name: msg_signature
      in: query
      description: |
        SHA-1 hash of the sorted concatenation of the WeCom app's Token,
        `timestamp`, `nonce`, and the encrypted XML message body, sent
        as the `msg_signature` query parameter on every WeCom callback.

  messages:
    # -------------------------------------------------------------------------
    # Official Account messages
    # -------------------------------------------------------------------------
    OfficialAccountTextMessage:
      name: OfficialAccountTextMessage
      title: Official Account Text Message Push
      summary: A follower sent a text message to the Official Account.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountTextMessagePayload'

    OfficialAccountImageMessage:
      name: OfficialAccountImageMessage
      title: Official Account Image Message Push
      summary: A follower sent an image message to the Official Account.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountImageMessagePayload'

    OfficialAccountVoiceMessage:
      name: OfficialAccountVoiceMessage
      title: Official Account Voice Message Push
      summary: A follower sent a voice message to the Official Account.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountVoiceMessagePayload'

    OfficialAccountVideoMessage:
      name: OfficialAccountVideoMessage
      title: Official Account Video Message Push
      summary: A follower sent a video message to the Official Account.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountVideoMessagePayload'

    OfficialAccountShortVideoMessage:
      name: OfficialAccountShortVideoMessage
      title: Official Account Short Video Message Push
      summary: A follower sent a short video message to the Official Account.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountShortVideoMessagePayload'

    OfficialAccountLocationMessage:
      name: OfficialAccountLocationMessage
      title: Official Account Location Message Push
      summary: A follower sent a location message to the Official Account.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountLocationMessagePayload'

    OfficialAccountLinkMessage:
      name: OfficialAccountLinkMessage
      title: Official Account Link Message Push
      summary: A follower sent a link message to the Official Account.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountLinkMessagePayload'

    # -------------------------------------------------------------------------
    # Official Account events
    # -------------------------------------------------------------------------
    OfficialAccountSubscribeEvent:
      name: OfficialAccountSubscribeEvent
      title: Subscribe Event Push
      summary: A user subscribed to the Official Account, or scanned a parameter QR code while not subscribed.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountSubscribeEventPayload'

    OfficialAccountUnsubscribeEvent:
      name: OfficialAccountUnsubscribeEvent
      title: Unsubscribe Event Push
      summary: A user unsubscribed from the Official Account.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountUnsubscribeEventPayload'

    OfficialAccountScanEvent:
      name: OfficialAccountScanEvent
      title: SCAN Event Push
      summary: A subscribed follower scanned a parameter QR code.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountScanEventPayload'

    OfficialAccountLocationEvent:
      name: OfficialAccountLocationEvent
      title: LOCATION Event Push
      summary: A follower reported their location.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountLocationEventPayload'

    OfficialAccountMenuClickEvent:
      name: OfficialAccountMenuClickEvent
      title: CLICK Menu Event Push
      summary: A follower tapped a CLICK-type custom menu item.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountMenuClickEventPayload'

    OfficialAccountMenuViewEvent:
      name: OfficialAccountMenuViewEvent
      title: VIEW Menu Event Push
      summary: A follower tapped a VIEW-type custom menu item.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountMenuViewEventPayload'

    OfficialAccountTemplateSendJobFinishEvent:
      name: OfficialAccountTemplateSendJobFinishEvent
      title: TEMPLATESENDJOBFINISH Event Push
      summary: Asynchronous delivery result for a template message send.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/OfficialAccountTemplateSendJobFinishEventPayload'

    # -------------------------------------------------------------------------
    # WeChat Pay APIv3 notifications
    # -------------------------------------------------------------------------
    WechatPayTransactionSuccessNotification:
      name: WechatPayTransactionSuccessNotification
      title: WeChat Pay Transaction Success Notification
      summary: Asynchronous notification that a payment succeeded.
      contentType: application/json
      headers:
        $ref: '#/components/schemas/WechatPayNotificationHeaders'
      payload:
        $ref: '#/components/schemas/WechatPayNotificationEnvelope'

    WechatPayRefundNotification:
      name: WechatPayRefundNotification
      title: WeChat Pay Refund Notification
      summary: Asynchronous notification that a refund was processed.
      contentType: application/json
      headers:
        $ref: '#/components/schemas/WechatPayNotificationHeaders'
      payload:
        $ref: '#/components/schemas/WechatPayNotificationEnvelope'

    # -------------------------------------------------------------------------
    # WeChat Work (WeCom) callbacks
    # -------------------------------------------------------------------------
    WecomTextMessage:
      name: WecomTextMessage
      title: WeCom Text Message Push
      summary: A WeCom member sent a text message to a self-built app.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/WecomTextMessagePayload'

    WecomSubscribeEvent:
      name: WecomSubscribeEvent
      title: WeCom Subscribe Event Push
      summary: A WeCom member was added to a self-built app's visible range.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/WecomSubscribeEventPayload'

    WecomUnsubscribeEvent:
      name: WecomUnsubscribeEvent
      title: WeCom Unsubscribe Event Push
      summary: A WeCom member was removed from a self-built app's visible range.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/WecomUnsubscribeEventPayload'

    WecomMenuClickEvent:
      name: WecomMenuClickEvent
      title: WeCom CLICK Menu Event Push
      summary: A WeCom member tapped a CLICK-type custom menu item.
      contentType: application/xml
      payload:
        $ref: '#/components/schemas/WecomMenuClickEventPayload'

  schemas:
    # -------------------------------------------------------------------------
    # Official Account base envelope and message types
    # -------------------------------------------------------------------------
    OfficialAccountBaseEnvelope:
      type: object
      description: |
        Common XML fields present in every Official Account message and
        event push. WeChat encodes payloads as XML inside a root
        `<xml>...</xml>` element; the property names below mirror those
        XML element names.
      properties:
        ToUserName:
          type: string
          description: The Official Account's OpenID (recipient).
        FromUserName:
          type: string
          description: The follower's OpenID (sender).
        CreateTime:
          type: integer
          description: Unix timestamp of message creation.
        MsgType:
          type: string
          description: WeChat message type (`text`, `image`, `voice`, `video`, `shortvideo`, `location`, `link`, or `event`).
      required:
        - ToUserName
        - FromUserName
        - CreateTime
        - MsgType

    OfficialAccountTextMessagePayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountBaseEnvelope'
        - type: object
          properties:
            MsgType:
              type: string
              enum: [text]
            Content:
              type: string
              description: Text content sent by the follower.
            MsgId:
              type: integer
              format: int64
              description: 64-bit message id.

    OfficialAccountImageMessagePayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountBaseEnvelope'
        - type: object
          properties:
            MsgType:
              type: string
              enum: [image]
            PicUrl:
              type: string
              description: HTTPS URL of the image.
            MediaId:
              type: string
              description: Identifier for retrieving the image via the multimedia file download API.
            MsgId:
              type: integer
              format: int64

    OfficialAccountVoiceMessagePayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountBaseEnvelope'
        - type: object
          properties:
            MsgType:
              type: string
              enum: [voice]
            MediaId:
              type: string
              description: Identifier for retrieving the voice clip.
            Format:
              type: string
              description: Voice format (e.g. `amr`).
            MsgId:
              type: integer
              format: int64
            Recognition:
              type: string
              description: |
                Speech-recognition transcription of the voice clip (only
                present when the Official Account has speech recognition
                enabled).

    OfficialAccountVideoMessagePayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountBaseEnvelope'
        - type: object
          properties:
            MsgType:
              type: string
              enum: [video]
            MediaId:
              type: string
              description: Identifier for retrieving the video.
            ThumbMediaId:
              type: string
              description: Identifier for the video thumbnail.
            MsgId:
              type: integer
              format: int64

    OfficialAccountShortVideoMessagePayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountBaseEnvelope'
        - type: object
          properties:
            MsgType:
              type: string
              enum: [shortvideo]
            MediaId:
              type: string
            ThumbMediaId:
              type: string
            MsgId:
              type: integer
              format: int64

    OfficialAccountLocationMessagePayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountBaseEnvelope'
        - type: object
          properties:
            MsgType:
              type: string
              enum: [location]
            Location_X:
              type: number
              description: Latitude.
            Location_Y:
              type: number
              description: Longitude.
            Scale:
              type: integer
              description: Map zoom level.
            Label:
              type: string
              description: Human-readable place label.
            MsgId:
              type: integer
              format: int64

    OfficialAccountLinkMessagePayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountBaseEnvelope'
        - type: object
          properties:
            MsgType:
              type: string
              enum: [link]
            Title:
              type: string
              description: Title of the shared link.
            Description:
              type: string
              description: Description of the shared link.
            Url:
              type: string
              description: The shared URL.
            MsgId:
              type: integer
              format: int64

    # -------------------------------------------------------------------------
    # Official Account event payloads
    # -------------------------------------------------------------------------
    OfficialAccountEventBase:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountBaseEnvelope'
        - type: object
          properties:
            MsgType:
              type: string
              enum: [event]
            Event:
              type: string
              description: WeChat event type.

    OfficialAccountSubscribeEventPayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountEventBase'
        - type: object
          properties:
            Event:
              type: string
              enum: [subscribe]
            EventKey:
              type: string
              description: |
                For users who subscribed via a parameter QR code, this is
                `qrscene_<scene>` where `<scene>` is the parameter value
                set when the QR code was generated. Empty for organic
                subscribes.
            Ticket:
              type: string
              description: QR code ticket (present when subscribing via a parameter QR code).

    OfficialAccountUnsubscribeEventPayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountEventBase'
        - type: object
          properties:
            Event:
              type: string
              enum: [unsubscribe]

    OfficialAccountScanEventPayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountEventBase'
        - type: object
          properties:
            Event:
              type: string
              enum: [SCAN]
            EventKey:
              type: string
              description: Scene value defined when the QR code was generated.
            Ticket:
              type: string
              description: QR code ticket.

    OfficialAccountLocationEventPayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountEventBase'
        - type: object
          properties:
            Event:
              type: string
              enum: [LOCATION]
            Latitude:
              type: number
              description: Reported latitude.
            Longitude:
              type: number
              description: Reported longitude.
            Precision:
              type: number
              description: Reported location precision.

    OfficialAccountMenuClickEventPayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountEventBase'
        - type: object
          properties:
            Event:
              type: string
              enum: [CLICK]
            EventKey:
              type: string
              description: The `key` value configured for the clicked custom menu item.

    OfficialAccountMenuViewEventPayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountEventBase'
        - type: object
          properties:
            Event:
              type: string
              enum: [VIEW]
            EventKey:
              type: string
              description: The URL configured for the tapped VIEW-type custom menu item.

    OfficialAccountTemplateSendJobFinishEventPayload:
      allOf:
        - $ref: '#/components/schemas/OfficialAccountEventBase'
        - type: object
          properties:
            Event:
              type: string
              enum: [TEMPLATESENDJOBFINISH]
            MsgID:
              type: integer
              format: int64
              description: ID of the template message send job.
            Status:
              type: string
              description: |
                Final delivery status — typically `success`, `failed:user
                block` (user blocked the account), or `failed:system
                failed` (delivery system failure).

    # -------------------------------------------------------------------------
    # WeChat Pay APIv3 notification envelope
    # -------------------------------------------------------------------------
    WechatPayNotificationHeaders:
      type: object
      description: |
        HTTP headers attached by WeChat Pay to every APIv3 notification.
        These headers MUST be verified before the encrypted resource is
        decrypted.
      properties:
        Wechatpay-Timestamp:
          type: string
          description: Unix timestamp at which the notification was signed.
        Wechatpay-Nonce:
          type: string
          description: Random nonce included in the signed canonical request.
        Wechatpay-Serial:
          type: string
          description: Serial number of the WeChat Pay platform certificate used to sign the notification.
        Wechatpay-Signature:
          type: string
          description: Base64-encoded SHA256-with-RSA signature of the canonical request.
      required:
        - Wechatpay-Timestamp
        - Wechatpay-Nonce
        - Wechatpay-Serial
        - Wechatpay-Signature

    WechatPayNotificationEnvelope:
      type: object
      description: |
        Outer envelope of a WeChat Pay APIv3 notification. The business
        payload lives inside the `resource` object as AES-256-GCM
        ciphertext keyed by the merchant's APIv3 key.
      properties:
        id:
          type: string
          description: Unique notification id.
        create_time:
          type: string
          format: date-time
          description: RFC3339 timestamp when the notification was created.
        event_type:
          type: string
          description: |
            Notification event type — for example `TRANSACTION.SUCCESS`
            for a paid order, or `REFUND.SUCCESS` / `REFUND.ABNORMAL` /
            `REFUND.CLOSED` for refund outcomes.
        resource_type:
          type: string
          description: Type of the encrypted resource payload (typically `encrypt-resource`).
        summary:
          type: string
          description: Short human-readable summary of the notification.
        resource:
          $ref: '#/components/schemas/WechatPayNotificationResource'
      required:
        - id
        - create_time
        - event_type
        - resource_type
        - resource

    WechatPayNotificationResource:
      type: object
      description: |
        Encrypted business payload of a WeChat Pay APIv3 notification.
        Decrypt `ciphertext` with AES-256-GCM using the merchant's APIv3
        key, the supplied `nonce`, and `associated_data` as AAD to obtain
        the plaintext business object (Transaction, Refund, etc.).
      properties:
        algorithm:
          type: string
          description: Symmetric algorithm used to encrypt the payload (typically `AEAD_AES_256_GCM`).
        ciphertext:
          type: string
          description: Base64-encoded ciphertext of the business payload.
        associated_data:
          type: string
          description: Additional authenticated data pas

# --- truncated at 32 KB (35 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/wechat/refs/heads/main/asyncapi/wechat-webhooks-asyncapi.yml