I would suggest having a Bitcoin payment method. I know it's NOT technically a nostr direct item, however Nostr users would probably be looking to support paying you in Bitcoin. OpenNode has a Wordpress plugin.
I am using open node on my Shopify B2B site. As I am doing B2B , I have to have automatic tracking notification and linking, Shopify is easier. I STRONGLY SUGGEST getting a working payment first that sends to your wallet in BTC first.
Once you want to have it go to your bank, you start having to do a bunch of KYC.
Rich