Credit cards basics

What are credit card “add-on products?”

When is my credit card payment considered to be late?

This month my payment is due on a Sunday. When is it really due?

What should I do if my payment does not show on my credit card statement?

I paid off my entire bill when it was due last month and still got charged interest. How can that be?

My bill shows the amount of fees I have paid for the entire year. What's that about?

Can the card issuer request information about my income, my age, and my Social Security Number when I apply for a credit card?

I’ve seen a lot of advertisements for companies that consolidate credit card debt. Are these legitimate?

Can I make issuers stop sending me credit card offers in the mail?

I am receiving many offers for new credit cards since I moved into my new home or took out my mortgage. Can I make the offers stop?