How to implement the basic Paypal payment in Opencart?
From Admin, go to Extensions > Payments. From “PayPal Payments Standard”, click the Install button.
And then edit.
Enter your Paypal e-mail, where you want to receive the payments.
Sandbox Mode: no.
Status: change to “enabled”.
That is all. The customers will be able to pay with Paypal from now on.
This payment method will appear on their checkout page.