In order to accept online payments, you will need to set up your Payment Options. Payment options will be universal for every school in the district.
Set up payment options for all Webstores and Tuition
Navigation: DCP > Online Payments > Setup > Payment Options
To enable the gateway, change the status to Active. Most schools only enable Credit / Debit Card - Transaction Express to accept online payments for a seamless webstore. (If accepting cash, be advised that parents will need to bring in their order receipt and payment to the school. Admins will run an additional process after this.)