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There are several options. A completely decentralized method is to use accept-nano. It's fully self-hosted. An easier but custodial option is NowPayments. More options listed here.
Nano is a different project. While they are still working on actively improving Nano, it is one of the very few crypto projects that is fully functional and deployed. You can accept payments in Nano right now by using https://nano.to - and not pay a cent in processing fees. You'll also get your transaction instantly. Comparing that to my stripe and paypal accounts where I have to pay 2.9% + $.30 and wait 5 business days for a transfer. You also don't have to deal with chargebacks/claims/etc
r/nanocurrency is where most of us Nano enthusiasts hang out, so feel free to join there and ask any questions, or you can DM/reply to me personally. If you want to see what Nano payments look like on a website, put.io has the accept-nano gateway implemented, while there are many other websites with Nano payments integrated listed here.