Master Agreements (MA) are utilized when the County desires a list of pre-qualified vendors to perform various services, on an as-needed basis. Buyer will not make any advance payments for Products.In cases of financial hardship, you may be able to enter into installment agreements at the Office's discretion, to facilitate collection of payments due. A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. A payment plan agreement is a written legal document that allows one party to make smaller payments over time to payoff a larger debt. Goods or Services – A payment plan created for a customer seeking to purchase goods or services with payments made over a short term (6-18 months). 4.6, Recipients of Services. 4.6.1.