Base on my experience most of the crypto store accepting with crypto payments have their QR scanner of the address of their bitcoin and of course at least you have a notifier to make sure the payment is already credited now if you want is P2P transaction where people transact with you directly
That’s correct and that’s what OP is asking about and how to implement it in his online store. Obviously, coding it from scratch will be a waste of time and money and that’s why the above members suggested some reliable third-party services (payment gateways) that can help him achieve the desired results with no cost, whatsoever.
too risky because Bitcoin is volatile the value is changing from time to time. Fiat system is still the best in terms of online payments transaction because it has fixed value.
If you really believe this is true, then what are you doing here! As I said earlier, if price volatility is a concern for you then you can exchange bitcoin to iat or any other stable coin as soon as you receive it. Some of the payment gateways will even do it for you automatically.