View the list of Sample Business Letters Acceptance of Purchase Security Agreement Disclaimer: Be aware that some of these sample letters have legal, financial, or other implications. If you are not sure about the use of any letter, consult with an appropriate professional first. Acceptance of Purchase Security Agreement Dear Attached is an accepted copy of your Purchase Security Agreement for the (specify equipment). There are (number) remaining quarterly payments. Your first quarterly payment will be due on (date) , and we will mail you an invoice for it approximately one month prior to that date. Please return the remittance portion of the invoice with your check. Under the Agreement, this contract is non-cancellable during the term of the contract. The balance, however, can be paid off at any time prior to the expiration of the contract. We would like to take this opportunity to express our appreciation for your business. If you have any questions concerning your contract, or if we can be of service to you in any way, please let us know.