Cycle Bot is a complete e-commerce bot for Telegram which we have recently developed for one of our client. The bot includes complete e-commerce functionality with a shopping cart and PayFast payment gateway integration.
At the same time it is extremely easy for the client to add and update their catalogue and items. All they have to do is to add the items with all the relevant information to a Google sheet and the bot takes care of the rest.
The bot also has the functionality to let only the registered users interact with it. Any non-registered new users are first prompted to register themselves. Registration is a simple matter of sending their details details in once click using Telegram's native send contact option.