Receive Credit Card Payments

I understand how to receive payments from customers online is easy, I just used paypal and they transfer money. But if someone writes their credit card information. on an order, how can I get their money in my account?

You must have a merchant account. Paypal (see market services) and many other "payment processing" companies to provide the service. All payment processing companies have access "online". It's like the terminal in the store, except you fill out an online form with credit card number and your address etc etc and the money is debited from your credit card and deposited in your bank account.

If you're sales are less than $ 5,000 per month use the Paypal Virtual Terminal and type of credit card sales. If you are the sales are over $ 5,000, consider setting up a merchant account or other ordinary type and those in a credit card machine or virtual terminal line.