Before installing and configuring, you need to request activation and homologation to PayPal, go to: https://www.paypal-brasil.com.br/contatocomercial/
If you have any questions, please contact PayPal support directly: https://www.paypal.com/br/selfhelp/contact/call
01) Access the Control Panel
02) After login click Modules >> Payment >> PayPal Plus Brazil
03) Click the INSTALL button, then click CONFIGURE
04) Fill in the fields:
REST Client ID
REST Client Secret
After clicking on the UPDATE button