# Backend Design: ECR-049 WeChat Auth + Consult Gateway

| Field | Value |
|-------|-------|
| ID | BD-2026-049 |
| Status | **Approved** |
| Coding | **In progress** |
| Migration | `000058_wechat_auth_gateway` |

## Boundary

```text
POST /api/v1/auth/wechat
  { code, encryptedData, iv } → existing SessionResult
users.wx_openid UNIQUE · wx_unionid · java_platform_user_id
user_sessions.java_access_token
ANY /api/app-api/*  → JAVA_BASE/app-api/*   (Go Bearer → Java Bearer)
ANY /api/admin-api/* → JAVA_BASE/admin-api/*
Java POST /app-api/oauth/internal/issue-mini-app  (X-Internal-Key)
Identity: wx_openid = t_platform_user_account.account (mini_app)
          phone     = t_platform_user.mobile
```

## Out

Module migrate · Java decommission · Admin auth · auto ECR-050