dkbit98 wow bitpay can be self hosted, I'm a huge fan of that, and it supports XRM and LTC which is also pretty awesome!!
Thank you a lot, currently this looks like the best solution.
And thank you for all the other responses as well

Bitpay wouldn't be a good choice at all and you can't host it. Your customer has to burn high fees to use Bitpay. Here is a list of payments processors where you can compare each other and choose the right one.
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https://bitcointalk.org/index.php?topic=5259548.0I think the BTCPay server would be better for you. You can host that or may use a third party as well. You can accept altcoin also through the BTCPay server. It's open-source and non-custodial where you have all the control of your funds.