Businesses ask how you are going to pay before they install. When they asked me how I said by check, they just said, “Oh.” I think that they have deals with banks for time payments or loans.
If the business asks you this, ask if they give a discount for cash - a lot of them will.
I got 20% off plus free desserts from a catering service by offering cash, a discount at the tire place for cash - and also for a fence I had installed.
Always worth asking.