Have you ever used btcpay server software? btcpay is amazing software that you can use to accept bitcoin directly without using a third party. It also allows you to setup your own store to sell your products.
You can create an account on my personal btcpay instance or use btcpay's offical demo site.
Be cautious when joining a random btcpay instance as they could steal your Bitcoin if they are skilled enough to modify the software
If you are looking for a list of btcpay server instance. There is a list of btcpay instances on their official site
It's best to find someone that you know & trust that won't run off with your Bitcoin and use their instance
My suggestion is to run your own instance but it requires some liunx cli knowledge to install & maintain the software
I am currently still in the process of setting up my own personal instance, learning, understanding the software. I have not yet enabled the lighting network on it.
If you use my instance and you forget your seed or passwords. I cannot recover any of it.