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4. Handle the Authorization

Upon clicking Approve, the user is redirected to your Redirect URI. The Redirect URI will have 2 variables: codeand state.

Flow

1. Compare the state value with the state you stored in the user’s browser session in Step 3 to verify the user session.
2. If the state matches, make a POST request to nos.app to retrieve the user’s Access Token.
3. Store the Access Token to your database.

PHP Example

if (!empty($_GET['code']) && !empty($_SESSION['state']) && $_SESSION['state'] === $_GET['state'])  elseif (!empty($_SESSION['state']) && !empty($_GET['state']) && $_SESSION['state'] !== $_GET['state']) 

5. Using the Access Token to Read User Data

You can use the Access Token token to register the user to your app, log them in, connect user data to an existing account on your app, and build features around your users’ cryptocurrency accounts. For example you can check if a user holds a specific amount of your token on one of their verified cryptocurrency addresses (retrieved by nOS.app API), and unlock a feature in an app, or grant bonus points/give starting XP in a game, etc.

• If you want to register the user, you should retrieve the user’s Account Details using the nOS.app API and store it in your database together with the Access Token.
• If you want to log in the user, you can check if the Access Token belongs to an existing user in your database.

In this tutorial we’re saving the Access Token to the user’s browser session. This is not recommended in production. You should store the Access Token in your database, and use a separate session token to keep the user logged in.

PHP Example

/**
* The code below is used to display the nOS.app user account data for an authorized user.
*/
if (!empty($_SESSION['access_token'])) 

Full PHP Example

For a full PHP example, view the nOS ID documentation here.

Good luck!