A Texas residential purchase agreement outlines the terms and conditions of an offer to purchase real estate. A payment plan agreement outlines an installment plan to repay an outstanding balance over a specified time frame.THIS AGREEMENT (hereinafter referred to as the "Texas Lease Agreement") is made and entered into this ____ day of. Control your purchase of printing, publishing, and digital services at competitive prices from hundreds of certified, tested, and reliable vendors. An installment purchase agreement is a contract where a seller will let a buyer incrementally pay for a property or asset. Download our free blank purchase agreement template in Word or PDF format: sample real estate purchase agreement template. A sales agreement is used to describe and track the exact details of quantity and cost of purchasing or selling goods, services, or real estate.