You have to create PayPal REST sandbox credentials and copy/move api/config/Config.php.sav to api/config/Config.php. Insert the credentials into api/config/Config.php as client_id and client_secret for the correct environment. To test card payments, using sandbox and the black button, use test card numbers.
A running LAMP environment is necessary. Clone the git to the root folder of that installation.
git clone https://github.com/tozielinski/pp-php-sdk-example.git
cd pp-php-sdk-example/api/config
cp Config.php.sav Config.php
Now you must add your credentials in Config.php.
An example can be found here.
This project is licensed under the MIT license - see the LICENSE.md file for details.