Bankers' Automated Clearing System
When setting up an eCommerce function for the "Friends" group an easy way for visitors to the website to make payments or donations is required. The easiest way is probably BACS.
Most online banking and apps provide the ability to make payments from one bank account to another. All that is needed is to develop a way of confirmation that a payment has been made. This should be easy using a text messaging service.
An alternative could be a PayPal button