I'm buying the image on behalf of an organisation for commercial use. How do I get a PO (Purchase Order) number for the invoice?

Once you've selected the usage that fits your needs, head to the Checkout page.

 If you need to add more information to your invoice, please click the 'Want to add more details to your invoice?' button.

 

This opens a form where you can add your Company Name, a PO Number, a VAT Number, and the Company address.