Jana here from the Shopify Guru team :)
I will reach out to you directly via email - as this is something that needs to be done internally by our Shopify Payments team.
You will need to provide us with your EIN and legal business name, as well as supporting documentation in the form of either your W9, or SS4 or confirmation of registration.
Please don't hesitate to respond to me directly on this thread, or via email for any clarification!
Jana A. | Shopify Guru