Which payment gateway to choose for bitcoin payments?

Question

API

Hello friends! It is planned to launch a service for selling electronic goods for crypto and other payment systems. In the service, each user will have the opportunity to replenish their personal account through bitcoin in order to purchase something in the service in the future. The question concerns the implementation of users' BTC storage. Where and how to store user addresses? Maybe there are ready-made solutions with open source code (I would be grateful). The idea looks something like this: when a user registers, his bitcoin wallet is created (visible throughout the network), with a zero balance, absolutely clean, as there is a bitcoin wallet, the user can replenish it, and then choosing a product on the service (for example, a TV) transfer to exactly the same wallet, the person who sells the TV, we want to take a commission for each transaction made on the site (replenishment of the user's balance, purchase of the user on the service). How to implement such an event? Thanks in advance.
PS Why is everyone so scolding TV Mystery MTV-2222LW?