One time membership fee

-- HikaShop version -- : 5.0.3
-- Joomla version -- : 5.0.2
-- PHP version -- : 8.2
-- Browser(s) name and version -- : Edge latest

I'm looking for a way to charge a one time membership fee. I'd like to automatically add this to the shopping cart as a one time charge. I'm using HikaSerial to put members into a Members group, but I don't know how to check membership and add one time membership charge if fee has never been paid.

It is a one time membership fee of $1 so forcing users to purchase $1 fee before being able to purchase products doesn't make sense. It is setup to automatically add $1 to each order, but we don't want to charge for every purchase. It was originally setup as a membership that puts users into a members group.

Excellent. Thank you.