For starters, go to Billing which you'll find under your workspace name in the top left corner:

Then, click View invoices and manage billing details. This opens Stripe's secure billing page in your browser.
Under Billing information, click Update information.

Here you can update the details that appear on future invoices, including:
If you need a purchase order (PO) number on your invoices, add it in the address field. If you're a business customer, we can also add it for you.
Click Save when you're done.
Note: