Thank you for your follow-up. I will do my best to assist further.
=How do I motivate this corporation without losing our account?
Tough question, and more of a business question than a legal one. Consider getting a meeting with the owner or the manager and offer a future discount on invoices if paid on time (make sure to later increase your rates to compensate for the short-term profit loss).
=How do I handle this matter positively and yet successfully without damaging our business relationship?
Just that, point out the past and your affordable, reliable, and successful assistance, and point out that in the future if you do not get payments up front, you will be forced to charge up-front for work that you now perform as a courtesy and based on past positive relationships.
=Is there any way to get them to feel the need to compensate for the good work they asked of us?
Honestly, no. That is purely at their discretion--but what you can do is provide them with competing company rates and show just how valuable you are to the organization.
Edited by Dimitry Alexander Kaplun on 7/1/2010 at 4:54 AM EST