You can find PayPal’s email address in the CS-Cart admin panel, in the settings of the payment method. Here’s how to proceed about it:
Go to “Add-ons > Downloaded addons”.
Find and install “PayPal Complete Payments (Multiparty)”.
Go to “Settings > Payment methods”.
Create a payment method with “PayPal Complete Payments (Multiparty)” as processor.
You’ll see the email on the “Configure” tab. We intentionally omitted it from the screenshot in the documentation.
Once PayPal provide you with your credentials, and you enter them in the settings of the payment method and save the changes, vendors will be able to connect their PayPal business accounts to your marketplace. They’d go to their profile in the upper right corner, choose “Seller info”, and switch to the “PayPal” tab. From there, they just press “Connect with PayPal”, and from there they’ll be taken to the PayPal account connection process.