What's the difference between monthly membership and one time payment?
If you have would like to have your billing and member management to go through Channels, you can choose to either set up a channel with a monthly subscription or a one time payment
Monthly subscriptions are great for monthly membership programs where members pay a fee every month to be a part of your Channel. Members pay the day of launch.
One Time Payment Channels are great for courses with a start and end date. Members pay up front, when registering for your Channel.