I would like to purchase a 360camsters product for a developer of mine. How to do that?

Just start the purchasing process as usual on our website.
On the Checkout page tick Purchase for someone else and enter the developers business email address.

Continue as usual.

This will happen:
1) You will get the invoice. In case it is a subscription you will be billed accordingly.
2) An account is created for the developer.
3) The developer receives an email describing how to log in, download 360 Private Publisher and register it with the licence you purchased for him.