For the shop functionality in the Website Creator you need the eCommerce tariff.
For the payment option in advance , your customer needs your account details. You can store this in the Website Creator so that this information is displayed in the e-mails and on the invoices.
To do this, log into the Website Creator and select the Modules section from the navigation menu> online store off. You can find this in the shop menu under Settings> Online Shop Information the ability to collect your account information. Please don’t forget to save the changes.