I tried to install paypal in welcart. Below is my setting:
In settlement setting, I fill out the API information.
In general setting, I select pay with "paypal"
I'm able to use Paypal sandbox account to do a test, but when I switch to the real account, and click paypal "buy now" button, I got an error message: Your order has not been completed
Do you know what's the problem? Or could you please provide me the procedure of paypal installation?