To generate client id and client secret you have to go to API & plugins option if you’re logged in (Instamojo- Sell online with your own website).
Click on "Create New Credentials" and select "Postman for Platform/Framework" from the dropdown menu. This will allow you to generate a Client ID and Client Secret. Click "Generate Credentials" to proceed.
Related Articles:
Connect WhatsApp Business Mobile Aps to Cloud API
