Hi @Jason Liu ,
OAuth is a protocol that allows one application to share a finite set of its private resources and data (through gadgets, for example) with another application. These applications could be a Confluence or JIRA site.
Using OAuth, you can access data within an Atlassian application installation externally.
Personal access tokens are a safe alternative to using username and password for authentication with various services.
You can go through below link to know how to use Personal Access Tokens
https://confluence.atlassian.com/enterprise/using-personal-access-tokens-1026032365.html
More details about OAuth is in https://confluence.atlassian.com/display/GADGETS/Configuring+OAuth
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