You can integrate paypal to your account and start accepting payments with Braintree (a PAYPAL company). Start by clicking the Integrate + button.
To find the required Braintree information follow the instructions here.
When you have your keys copy and paste them on the designated fields and then click the Save & connect to Braintree Credit Card Payments button.
You can deactivate the integration by clicking on Deactivate integration.
Click confirm on the pop up window and your integration will be deactivated.