We are staying at a motel and we are paying $65 per night. This is my sugest.

We are staying in a motel and paying $65 dollars a night. Or per night. You pay for a meal, but if you add numbers, then you leave out 'for'.

Natural English: We are paying $65 a night for a room in a hotel. (Or ‘the room in our hotel’ or ‘our room in a/the hotel’ and others) This is how to use ‘for’ correctly. It’s understood that you are staying there. The choice of articles gives the listener information about what kind of hotel and room options there are, and/or what factors are important to you. It’s good to be aware of the kind of information that can be communicated with a small number of little words!

You are not paying FOR money. That would mean you are buying money. Take out the FOR and it will be ok.