This is step on how to get Instagram Feed Access Token. 

1) Go to https://developers.facebook.com/ > Log in by using Facebook Account

2) Click in Create App button.

3) Choose App type > Click Consumer > Scroll down click Next button

4) Add application name to display > Enter email address > Click Create App button

5) Select Basic setting > Scroll down click Add platform button

6) Choose Website platform and click Next button.

7) Add url of your website (EX: your domain name) > Click in Save Changes button

8) Click Add Product > Select the basic Instagram display API

9) Click Basic Display setting > Click Create New App button

10) Keep name or add new name > Click Create App button

11) Enter the website domain for Client 0Auth Settings, Deauthorize and Data Deletion Requests

12) Go to Roles > Click Add Instagram Testers

13) Search and select Instagram username to send invitation.

14) Go to Roles > Click Add Instagram Testers

15) Search and select Instagram username to send the invitation.

16) Login Instagram account > Profile > Settings > Apps and Websites > Tester Invites tab > Accept the invitation

17) Go back to App > Instagram Basic Display > Click Generate Token 

18) Will appear a new window in which you must access your Instagram account.

19) Click Allow button

20) Click on show access token > Copy access token and provide us in Whatsapp Group > Click Done 

21) Click Save changes button