Launch and first paying customer

Made a billing integration with Stripe. Filter allows adding many plans and bind them to telegram accounts. So this feature added a lot of UI complexity.

Since the previous update, I also built a proof of concept project that uses a webhook feature. In the process, implemented an export feature for Filter. This feature gives old messages in JSON format so client projects can bootstrap some history.

Did some technical improvements. Added more error handling, alerts so I would know when something goes wrong.

Send with Sengrid email to 40 registered users. And got one paying customer.

Now is time for marketing.