Wechat Login Facebook Online

"openid": "oUpF8uMuAJO_M2pxb1Q9zNjWeS6o", "access_token": "ACCESS_TOKEN", "unionid": "optional"

"id": "101010101010", "name": "John Doe", "email": "john@example.com" wechat login facebook

For most apps, implement and merge user accounts on the backend using email or phone number as the common identifier. Overview WeChat does not natively support “Login with

// Sign in with Facebook const fbCred = FacebookAuthProvider.credential(fbToken); await signInWithCredential(auth, fbCred); // Later sign in with WeChat (via custom token) const wechatToken = await getWechatCodeFromSDK(); const customToken = await backendExchangeWechatCode(wechatToken); await signInWithCustomToken(auth, customToken); // Firebase links accounts if email matches | Goal | Feasibility | |------|--------------| | “Login to WeChat using Facebook credentials” | ❌ Not supported by WeChat | | “Login to your app using WeChat or Facebook, with linked accounts” | ✅ Fully supported via backend account linking | "unionid": "optional" "id": "101010101010"

Here’s a proper write-up explaining — including the technical flow, requirements, limitations, and a step-by-step implementation overview. WeChat Login Using Facebook: Technical Write-up 1. Overview WeChat does not natively support “Login with Facebook” as a first-party authentication method. However, a user can bind their Facebook account to WeChat after logging into WeChat, or a third-party app can facilitate login by offering both WeChat OAuth and Facebook Login separately — then linking accounts on the backend.