The Simplify Commerce module is not included in the PrestaShop download by default. You can download the add-on for Simplify Commerce from the following link: https://github.com/fingent-corp/simplify-prestashop-mastercard-module/releases/latest.
Make sure to choose the latest release that matches the version of PrestaShop you are using. After downloading the ZIP file, extract it and rename the directory to “simplifycommerce”. Then, zip the directory again with the new name. Finally, upload the zip file, configure the API keys, and you’re ready to use the module!
You can manage your merchant account (view orders, perform refunds, create invoices, etc.) using your merchant portal.