We sell in the US but are not a US-based company. How can I onboard with Stripe?

You will need an EIN number, a US phone number, and a US address to complete our Stripe onboarding. You can apply as a foreign entity for an EIN number - here are the instructions to do so. If you do not have a US phone number affiliated with your business, you can use the resources here to get one, and you should use a US address affiliated with your business.