You are requested to send a list of goods sent, with their prices along with the parcel so that the payment can be done immediately.

One word substitute is Invoice.

Agenda: a list of items to be discussed at a formal meeting.
Invoice: a list of goods sent or services provided, with a statement of the sum due for these; a bill.
Catalogue: a complete list of items, typically one in alphabetical or other systematic order.
Inventory: a complete list of items such as property, goods in stock, or the contents of a building.