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OpenAPI Specification
openapi: 3.2.0
info:
title: WeChat Mini Program Server API (subset) Access Token User Information API
description: 'Subset OpenAPI description for the WeChat (Weixin) Mini Programs server-side
API hosted at `api.weixin.qq.com`. Covers the foundational endpoints needed
to bootstrap a Mini Program backend: exchanging a temporary login code for
a session via `auth.code2Session`, minting an application access token via
`auth.getAccessToken`, and retrieving a paid-only UnionID via
`auth.getPaidUnionId`.
Authentication for these foundational endpoints is keyed on the Mini
Program''s AppID and AppSecret, passed as query parameters. Subsequent
business APIs (template messages, content moderation, analytics, QR codes,
logistics, etc.) require the `access_token` obtained from
`auth.getAccessToken`.
'
version: 1.0.0
contact:
name: WeChat Developer Community
url: https://developers.weixin.qq.com/community/
license:
name: Proprietary
servers:
- url: https://api.weixin.qq.com
description: WeChat production API
tags:
- name: User Information
description: User identity (UnionID) lookups.
paths:
/wxa/getpaidunionid:
get:
tags:
- User Information
summary: auth.getPaidUnionId
description: 'Retrieve a user''s UnionID after they have completed a WeChat Pay
transaction in the Mini Program. Requires either `openid` plus
`transaction_id`, or `openid` plus `mch_id` and `out_trade_no`.
'
operationId: getPaidUnionId
parameters:
- in: query
name: access_token
required: true
schema:
type: string
description: Application access token from `auth.getAccessToken`.
- in: query
name: openid
required: true
schema:
type: string
description: The user's openid in the Mini Program.
- in: query
name: transaction_id
schema:
type: string
description: WeChat Pay transaction id (optional if `mch_id` + `out_trade_no` are supplied).
- in: query
name: mch_id
schema:
type: string
description: WeChat Pay merchant id (used with `out_trade_no`).
- in: query
name: out_trade_no
schema:
type: string
description: Merchant-side order number (used with `mch_id`).
responses:
'200':
description: Paid UnionID result.
content:
application/json:
schema:
oneOf:
- type: object
properties:
unionid:
type: string
description: Cross-application UnionID for the paying user.
errcode:
type: integer
errmsg:
type: string
- $ref: '#/components/schemas/WeChatError'
components:
schemas:
WeChatError:
type: object
description: Standard WeChat API error envelope.
properties:
errcode:
type: integer
description: Numeric WeChat error code; `0` indicates success.
errmsg:
type: string
description: Human-readable error message.
externalDocs:
description: WeChat Mini Program Server API
url: https://developers.weixin.qq.com/miniprogram/en/dev/api-backend/