Spanish to English Bus/Financial Business/Commerce (general)

Hi everyone,

Can anyone tell me the proper translation into English of facturas vencidas and monto vencido in the following sentences:

"A mas tardar estaremos enviando transferencia bancaria por $... a fin de cancelar la totalidad de las facturas vencidas hasta el 30 de septiembre."

(At the latest we will be sending a bank transfer for $.. to pay all the OVERDUE (?) PAYABLE (?) invoices up until September 30.)

and:
"Le comunico que estoy imponiendo un "shipment hold" para la cuenta de.... por el monto vencido con el que cerro el mes pasado de septiembre."

(I am letting you know that I am imposing a shipment hold on ...'s account for the OVERDUE (?) PAYABLE(?) amount with which it closed in September.}

Help!!
Thank you!
P. Weist