How do I stop subscription charges?

Good day! I'm hoping you can help me with a question I have regarding subscription charges. I've recently noticed that I've been charged for subscriptions that I didn't know I had. Could you please walk me through the steps on how I can stop these subscription charges? I'm particularly interested in knowing if there's a way to identify and cancel any unwanted subscriptions on my bank account or credit card. Additionally, would it be possible to get a refund for any charges that have already been made? I'd appreciate any guidance you can provide on this matter. Thank you!