How do I get an access token from an authorization server?

Answered by Willian Lymon

To get an access token from an authorization server, you typically need to follow the Authorization Code grant method. This involves a series of steps that involve exchanging an authorization code for an access token.

1. Start by obtaining the necessary credentials from the authorization server. This usually includes a Client Identification and Secret, which are unique identifiers for your application. These credentials are used to authenticate your application with the server.

2. Once you have the credentials, you need to redirect the user to the authorization endpoint of the server. This is typically done by constructing a URL that includes the necessary parameters, such as the client identification, redirect URI, and scope. The scope defines the level of access that your application is requesting.

3. When the user is redirected to the authorization endpoint, they will be prompted to log in and grant your application the requested permissions. This step ensures that the user is aware of and consents to the access that your application is requesting.

4. After the user grants permission, the authorization server will redirect the user back to the redirect URI specified in the initial request. This redirect includes an authorization code as a query parameter.

5. Your application needs to exchange this authorization code for an access token by making a request to the token endpoint of the authorization server. This request typically includes the client identification, secret, redirect URI, and the authorization code received in the previous step.

6. If the request is successful, the authorization server will respond with an access token. This token is a credential that your application can use to access protected resources on behalf of the user. The response may also include additional information such as an expiration time for the token.

7. Now that you have the access token, you can include it in your API requests to the server by adding it to the request headers or including it as a query parameter. This token will be used to authenticate your application and authorize access to the requested resources.

It’s important to note that the exact steps and parameters required may vary depending on the specific implementation of the authorization server you are using. It’s always a good idea to consult the documentation provided by the server to ensure you are following the correct process.

Obtaining an access token from an authorization server involves redirecting the user to the server’s authorization endpoint, obtaining an authorization code, and exchanging it for an access token at the token endpoint. This process ensures that the user grants consent and allows your application to access protected resources on their behalf.