Dear :

Enclosed is our order (#) for [quantity] of [products].

As you know, we have been ordering from you quite regularly for more than months. We would like to know if you could allow us to settle our accounts by monthly statement. We feel that our payment record during the past months has been good enough to qualify us for open account. We will be glad to supply references if you desire.

We look forward to your decision.

Sincerely yours,

[name]

[title]