In case of personal accounts, we can send invoices for Premium licenses. Upgrades to Professional tier must be paid with a card.
ThingLink does not accept POs for individual account purchases. Individual accounts can be upgraded using the upgrade button in the top navigation bar of ThingLink.com and paid for via credit card or PayPal (US only).
We do accept POs for group purchases of many licenses, school-wide licenses, and corporate plans. If you are uncertain whether we will accept a PO for your purchase, request a quote here.