Toughones, a car part manufacturer, entered into a contract to license

software is to be used to keep track of inventory, accounts receivable, and other financial data. After the software was installed

the computer system worked but it had a few glitches. Toughones refused to pay the full amount in the contract. To settle the

dispute, the parties agree that $$180,000$ is to be paid as full and final payment for the software. Toughones paid the $$180,000$

agreed. What kind of agreement did Toughones and Vizera reach in the end?