Step 1
Go to Facebook developers tools and create a new application.
Step 2
Enter the created application and go to Settings – Basic. Scroll down and add a platform (site). Then save the settings.
Step 3
Products – Instagram Basic Display. Create a new app.
Step 4
Set the redirect URI and other links
Step 5
Add a tester. This must be the Instagram account for which you receive the key.
Step 6
Go to profile settings in Instagram and accept the invitation.
Step 7
Using Instagram App Id and Redirect URI, follow the link:
https://api.instagram.com/oauth/authorize?client_id=INSTAGRAM-APP-ID&redirect_uri=REDIRECT-URI&scope=user_profile,user_media&response_type=code&state=1
and confirm the authorization
Step 8
Save the code from the address you were redirected to:
https://helpforsite.com/oauth/?code=AQCigVXLoUCP2dkdpctca2x-xGEnkyXPecWbLTS_tQ5E1ehrsjBZydqyRn6unhIMzkBRye466PaCF0tUXcrhmXDLYFfh7IvDy1GZGmjEMDTSTByLw6_qyIZjeT_7xaY_JF3BcxmR6zxMb4_CZANmP5jNfPibH1Xu2rJpDPG29-IeaY0wwuUTVNu884V0rc0ymX2Lc0VsKbK1BQtozFYwrs0lCWcyqf_JTacGxr_ddm1dsQ&state=1#_
Step 9
Now you have to make a POST request to https://api.instagram.com/oauth/access_token to obtain a short-term access token. This is what it looks like when you use curl in a console:
curl -d "client_id=INSTAGRAM-APP-ID&redirect_uri=REDIRECT-URI&grant_type=authorization_code&client_secret=INSTAGRAM-APP-SECRET&code=CODE " https://api.instagram.com/oauth/access_token
In return, you get JSON containing access_token
Step 10
Follow the link using the access_token:
https://graph.instagram.com/access_token?client_secret=INSTARGAM-APP-SECRET&grant_type=ig_exchange_token&access_token=ACCESS-TOKEN
In return, you get JSON with a long-term key for 60 days.
Step 11
To update the long-term access key, use the link:
https://graph.instagram.com/refresh_access_token?grant_type=ig_refresh_token&access_token=LONG-LIVED-ACCESS-TOKEN
The update should be done while the key is still active.