I am creating posts for my plugins to make it easier to find them using the forum search and not just the docs search.
I am currently building a membership plugin that extends beyond the functionality of managing users (plugin from 2017 by @starckio).
My plugin is centered around Stripe as gateway for subscriptions and one-time payments. It can automatically create users after a successful subscription and has helpers to build frontends with a page hierarchy and content filtered by the users subscriptions/purchases.
Unlike with all my other free plugins I will charge an affordable lifetime license fee for the membership plugin. This decision is mostly based on the fact this plugin will allow you to make revenue directly. I have not yet decided on the pricing and I am looking forward to your expectations.
I have created a private discord channel to discuss the current features and your usecases.
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Join my Membership Channel if you want to know more or suggest features.
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I need to assign the Discord role manually so please be patient after signing up, it might take me up to a day or two.
Here are some impressions of the work in progress taken from the test suite included with the plugins source code:
VIDEOS
SCREENSHOTS
account page demo
one-time purchase of products and subscriptions from stripe
Automatic creation of Kirby CMS accounts for members
Members can log in without a password using a “magic link” sent via email
Members can subscribe to plans via Stripe
Members can purchase one-time products via Stripe
You can set permissions on Pages/Files/Block to which plan they are available from within the Panel
You can add custom fields to the member blueprint and define read/write permissions
You can use 
Switching subscription tiers
Tracking of progress
Member data encryption
Gravatar integration
Discord notifications
Can be used to create Paywalls