Please check below the topic explained on this page:
1. Create an App on the PayPal Developers website
Please follow the instructions below:
Go to https://developer.paypal.com/ and sign in
Click on My Apps & Credentials (at the Left Menu).
Note that you have two options in the first section (My apps & credentials): Sandbox and Live. It would be nice to create an App for both environments, so they can also test their funnels before processing real orders. Then, click on Create App button (see the image below)
After creating your app, you will see a screen like the one below. We need an account, secret, and client id
If they want to sell using the Credit Card Form instead of the Checkout with PayPal Button, the client must enable the feature in their PayPal Account (it was called Payments Pro, but it looks like PayPal has renamed it). Please, contact our Banking Team if you need more information about it kindly refer to the DFO Banking Team, or check this link out: https://developer.paypal.com/docs/paypal-payments-pro/