This Master Sales Agreement (the "Agreement") is entered into between the buyer listed on the applicable Purchase Order ("Buyer") and Calimetrix, LLC. Agreement or any other document in the form attached to this DS Supplier Master.Allegheny College will allow multiple payment plan agreements per student per term. Nelnet refers to this as Parallel Agreements. Learn about forming and registering your business online, and how to complete other types of business filings. Register your business (opens in a new tab). An installment agreement requires the buyer to pay the seller the purchase price in installments over time. Your Sales Agreement, or. (5) Capital Assets. 153. Allegheny College will allow multiple payment plan agreements per student per term.