Putting $4k on credit card for furniture and immediately paying off?

New house so we need new furniture. And we have money saved.

Last time the store didn’t even ask us how we wanted to pay. It was just “okay this is the monthly financing, sign here”

I immediately paid it the next day.

…. But I don’t want to do that.

Instead of swiping my debit card (because I don’t normally have $4k just sitting in the checking account) is it a bad idea to put it on my credit card?

1. my card says I have $7k available in credit.

2. I will pay it off tomorrow

3. I get 2% cash back in rewards

this seems like a no brainer but I wanna know if this is dumb before the sales people hound me into not doing this