I have achieved to have working the paypal processor I leave here the steps I made if some noob like me needs the info:
Simply add to settings.py the fields:
SHOP_HANDLER_PAYMENT = "cartridge.shop.payment.paypal.process"
PAYPAL_USER = "YOUR PAYPAL API USER"
PAYPAL_PASSWORD = "YOUR PAYPAL API PASS"
PAYPAL_SIGNATURE = "YOUR PAYPAL API SIGNATURE"
Then you need to create a new paypal sandbox account. There paypal gives you dummy CC data (in my case that didn't work so I used
this)
You have to specify the country code in the shipping address (in my case ES for Spain)
Hope this helps someone :)
@Kenneth Bolton You are right, thank you for the help but I wish I knew how to write it...
Best,
Dani