I messed up and accidentally dinged my friend’s car. How much will it cost to make this right?

I’m the clumsiest idiot in the world and I accidentally hit my friends car when opening my right rear door 🤦‍♂️

I want to make this right but idk what the best way to get it fixed is. How much would it cost to fix this? Is it better to just go through insurance?

Thanks everyone!