Does Webflow have a payment platform?
Webflow currently only integrates with Stripe and Paypal which is admittedly a teensy bit limiting considering the amount of payment partners out there, but they are best in class tools and worth checking out if you're unsure. Paypal is available in more regions than Stripe, but Stripe does offer a great service called Stripe Atlas where they register and set up a company for you in the United States if your region isn't covered. They'll pretty much do everything and at the end of the process you'll have a company registered in the US for the cost of $500. If you're unsure about either Paypal or Stripe you can see where they support receiving payments here and here.