Understanding the OAuth Authorization Flow Using a WeChat Login Example

We often use third‑party accounts to log into platforms, such as using a QQ account for iQiyi or a Weibo account for the Ziroom app. During login, the platform requests permission to access the user's public profile or other data, which follows a complex OAuth authorization flow.

The article uses a WeChat login to Ziroom as an example: the app asks for access to the user's WeChat public information, and when the user confirms, the OAuth process begins.

The main steps of the OAuth flow are:

1. The user initiates login with WeChat. 2. Ziroom requests permission to access the user's WeChat profile. 3. The user agrees. 4. Ziroom receives a callback URL and requests a code from the WeChat server. 5. WeChat returns the code . 6. Ziroom exchanges the code and callback URL for an access_token . 7. WeChat returns the access_token . 8. Ziroom uses the access_token to retrieve the user's WeChat data.

Key points to note:

1. The code is time‑limited and should be exchanged for an access_token within a few minutes. 2. The access_token also expires, requiring a new token to be obtained after expiration.

In business scenarios, third‑party devices or services often need similar OAuth authorization to allow a private cloud to access or control devices hosted on another cloud; the flow remains essentially the same.

Conclusion: The author encountered this flow during IoT cloud testing and now understands the OAuth process for third‑party logins. For deeper details, one can study the OAuth authentication principles.