In order to accept payment via PayPal you need:
- Create and configure REST API application on PayPal developer site. For more information please read Manage your applications.
- Add payment processor on Sippy Softswitch. Use PayPal REST API (PayPal) payment gateway to accept PayPal payments and PayPal REST API (Credit Cards) to accept payments by credit cards.
- Configure API Credentials - the sandbox (Test) or live (Production) account Client ID and Secret used to make API calls:
Here are the screenshots of the pages (taken from PayPal portal on Jul 6, 2018) where you can get Client ID and Secret: