Flexkit is a powerful build-anything-you-want HTML API for payments, e-commerce, user authentication and customer management. It's like using Stripe, but without the need to write any code... or have a server... or have a database.
Flexkit can turn your pages, even static HTML mockups, into full-fledged billing & membership systems JUST using HTML.
The simplest way for small businesses to offer monthly payment plans to their customers.
Benjamin Powell- Founder Adsoup.com & Startup Infomaniac
Could be a solution, charge to join a channel where you update files?
Not quite what you want but may be a work around.Telemonetize is a tool to run a subscription membership for your Telegram channel.