In order to configure the provider for online payments we will go to:

System → System Configuration



When entering inside we will click on Finance in the menu of the left and in Electronic Commerce:



In the drop down we find different payment platforms with card. (REDSYS, 4B, RURALVIA, UNICAJA, PAYPAL and CECA)



REDSYS: We will need to complete the trade number.
4B: We will need to complete the trade number, the entity code and your signature.
RURALVIA: We will need to complete the trade number.
UNICAJA: We will need to complete the trade number.
PAYPAL: We will need to complete the trade number, which in this entity is the email.
ECSC:We will need to complete the trade number.