On top of what Dabs has said you would really like to go and use Electrum instead of merchant services like Bitpay and Coinbase commerce if you want to avoid some additional cost and of course unwanted KYC. What they'll just offer you is the convenience of having the html code ready to be plugged into your website and also the availability of liquidating your BTC payments quickly in your bank but you'll be paying Bitpay and Coinbase a cut of your earnings on every transaction you make with them. Here is Electrum's official
guide on applying your Electrum wallet as a payment gateway for your website.
Wow. This is nice!
I didn't know it's so straightforward with Electrum!
There's a good YT tutorial here ->
https://www.youtube.com/watch?v=9PNHvr0e7sII always wanted to add bitcoin for my webshop though, unfortunately I think I have to use use BitPay because I need to get FIAT on my company account so it can be legal :/ Can't bookkeep sales in crypto. I think.
That does not mean that it is impossible. If you work with WordPress and Woocommerce, a good module for FIAT is "Stripe" it works really well for our website. And it was to be validated by Stripe (Yes they carry out a verification before validation) After which, you can determine on what bank account the collected money will be sent.
But otherwise I saw that there is also a similar module for sites not using Wordpress try looking on the internet for more information.