Click on I agree to the Pinterest Developer Terms and the API Policy checkbox and then click on Create app button.
Enter Name and Description of your application.Click on Create button.
Enter Site URL and Callback URL in the Redirect URIs(from your social login Instructions)
Please click on Submit for review button. Enter the required information and click on submit to send your app for review.This custom app will not work until your app will not get verified from Pinterest
On the same page you will be able to see your Client ID and Client Secret under the Application credentials section.
Step 2: Set credentials in miniOrange Social Login Plugin
Copy the Client Id and Client Secret form above setup and Paste them into the fields in Instructions.
Then click on Save & Test Configuration button.
Custom app will set properly when Test configuration get successful