Use the tips and resources below to help protect yourself and prepare for your next automobile purchase. Click on the topic to learn more.I'm new to car financing. What got me confused is that my bank wants purchase agreement or bill of sale before sending out a check to the dealer. Whether you're looking to upgrade or need to get out of your current loan, following these steps will help you navigate the process smoothly. The purchase agreement is between you and the seller in this case, the dealership. It has nothing to do with financing. Don't make buying your next car complicated, come to Bueno Used Cars for flexible financing. Have questions about Financing? 1 If you're financing your purchase ; 3 The actual vehicle purchase agreement ; 4 Buyer's trade in certification ; 5 Warranty disclaimer and documentary fee notice.