Wrongfully Given Driving Without License Citation

I'm from Maine and was over in Penn for the holidays. One of my friend was driving my car (with me in the passenger seat) at around 3.30am (5 minutes away from home) in Pennsylvania. Cop pulled us over for apparent turn signal violation. He mentioned that he was hoping the driver was drunk.

The driver had a valid foreign (Indian) driving license and has US entry date within a year of the date when we were pulled over. I removed my seat belt to reach for the papers from my glove box.

I got cited for Letting a person drive the car without a license ~170$ Not wearing seatbelt ~100$

My friend for Driving without a license. ~350$

I don't want this affecting my insurance rates and 600$+ fine is too much. The fact that my friend did have a license and that the cop refused to accept it, brings me here.

What would be the best course of action here and how can I minimise whatever I have to spend to fight this?