Dear Felix
We are pleased with your [products / services]. Nonetheless, we have a request to facilitate future business together.
As you know, you have been kind as to extend to us a [CREDIT TERMS, ex. 30-day credit term] for the past [DURATION, ex. year]. I’m sure that you will agree that we have always been prompt and on-time with our payments. To allow us to pay you earlier, allowing you to clear your accounts in a timely fashion, we would like to request an early payment discount, such as offered by your competitors. Indeed, you will agree that this request is not unreasonable in light of the volume of business we foresee to do together in the future.
Your timely response would be greatly appreciated.
Regards
Lydia