Create a channel that allows people to direct message each other within it. The purpose of this channel is to bring structure to gated private discussions within a server. Usually, this would occur on a platform level where everyone can DM each other - there isn't a lot of ways to prevent people from sliding into your DM. So instead, we decided to create a channel (which has all the abilities to be private / billable / public) and from there, users can choose to DM a pre-approved group of people. This would be particularly useful in cases where you have a channel that is dedicated to providing support. In this case, you don't wish to allow just about anyone to walk in and start typing - you'll want it to be a private channel that only people you have approved (eg. they produce a receipt of purchase), then you let them through. Or it could be useful in cases where you want to let your fans talk to you personally - but only allow the VIPs to do so (billable channel). So once they get access to this channel, they will have access to chatting with you.
We're working on adding individual billing capabilities on a #channel level. The server owner will have the ability to lock a channel and only allow paid users to get access into it. There will be flexible subscription options (one-off , recurring) with different intervals (monthly, yearly) and an option to add an up-front fee.