How do I update my Tax ID number?
In order to update your Tax ID number, login to your business account, and go to the 'Admin' section. Then, click 'Credit Card Processing' under 'Business Information' on the left. Enter your Tax ID and re-enter your bank details. Don't have one? Here's a link to the US Govt Tax ID number information page:
Click 'Save' at the bottom and you're done!