Please correct my text

[Zoe2008]

We will settle you payment for PO 13 & 14 frist. Two remaining payments for PO 17 & 23 will be settled upon the certificate receive. Please expedite them to us to avoid delay payment as both them are shipped in 2008.

[Soup]

We will settle the payment for PO 13 & 14, first. The two remaining payments, PO 17 & 23, will be settled once we receive the certificate/certification/the paperwork(?). Please expedite them as soon as possible to avoid additional late payment fees, as both were shipped in 2008.