How to make a smart contract which pays out only if a service is performed?

Question

Hello I am new to the world of solidity.

I am trying to create a smart contract with the following conditions:

• a customer wants to buy a service/product from a retailer (me).
• the price of my service (in tokens) is dictated by me and can be changed in the future
• the tokens must be on hold until i perform my service
• the tokens are released to my account only if I perform my service otherwise they are sent back to the customer.

Are you aware of some project, tutorial or documentation similar to what I want to achieve so that i could learn from it?

Answer 1

The term to implement you are looking for is called atomic transactions. Just look for atomic transactions in ethereum.