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OpenAPI Specification
openapi: 3.2.0
info:
title: WeChat Mini Program Server API (subset) User Information API
description: 'Subset OpenAPI description for the WeChat (Weixin) Mini Programs server-side
API hosted at `api.weixin.qq.com`.'
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/