Smart contracts for subscribtions

[SvenJ]

Hello guys,
I want to discuss if it´s possible to create an smart contract which works similar to a standing order. I want clients to buy my monthly subcribtions per smart contract on a blockchain.

So my questions are:
Is this possible on a blockchain (which functions are possible/ which technology should i use ether, cardano..)?
How can i connect a smart contract to the “real world”?
Is anyone interested in starting such a project with me?
Any other ideas related to that topic of financial services?

Greetings
Sven