Trello uses token-based authentication to grant third-party applications access to their API. When a user has granted an application access to their data, the application is given a token that can be used to make requests to Trello's API. Trello's API can be accessed in 2 different ways. The first is using Trello's own Authorization Route, and the second is using OAuth1.0.

Trello Authorization Route

At the moment of registration, Trello assigns an API key and Token to the account.

Note: Set AuthScheme to Token to activate this authentication method.

At the moment of registration, Trello assigns an API key and Token to the account. We can retrieve this API key after logging in to Trello and visiting https://trello.com/app-key. After obtaining your API key, you can use it to obtain a Token by visiting https://trello.com/1/authorize?expiration=never&name=MyPersonalToken&scope=read,write,account&response_type=token&key={Key} and replacing {key} with the obtained API key. After visiting the page, you can authorize the application to use your account by clicking the allow button. You'll be redirected to a page with your token. To make requests to Trello's API you will need both API key and Token.

Note: You can change the expiration time of the token by changing expiration= with one of the following values (1hour, 1day, 30days, never).

Set:

• APIKey: The key found at https://trello.com/app-key
• Token: The token obtained

OAuth

Note: Set AuthScheme to OAuth to activate this authentication method.

Similar to using Authorization, OAuth creates an Application Id and Secret when you create your account. See Using OAuth Authentication for information on how to to connect.