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It looks like Atlassian does take POs though. Is there something about the way they (or other SaaS) companies take POs?

How do I submit a Purchase Order (PO number) to Atlassian? (https://www.atlassian.com/licensing/purchase-licensing#order...)

To get started, complete our secure online Quote & Order Form. On the final confirmation page, check the PO number box to add your PO number. The PO number will appear on your quote or invoice (valid for 30-days). If you already have a quote or invoice, you can update the quote or invoice through my.atlassian.com via the Orders tab.

Atlassian is happy to reference a PO number on a quote or invoice for your internal tracking and record keeping. However, we do not accept purchase orders as a form of payment nor the terms and conditions commonly associated with purchase orders. We provide fully functional trial licenses for you to use while payment is being arranged. We are able to keep our prices low by offering standard product agreements to all our customers and do not offer commercial credit.