Is this sentence correct?

[Zoe2008]

Please send us an guarantee letter to declare you agreed those payment by T/T and promise will close those documents after receive our payment. Please indicate your invoice number, amount and PO number on the letter.

[Route21]

Hi Zoe

"Please send us a guarantee letter certifying:
a) agreement to pay by T/T and
b) commitment to close those documents on receipt of our payment.

Please indicate the invoice number, amount and PO number on the letter."

Hope this helps
R21