PayPal
PayPal is an online payment system operated by eBay. Each PayPal customer has an online account which can be funded via credit card, direct debit, or bank transfer. Money can be instantly transferred to other PayPal customers using the recipient's e-mail address. You can organise credit card payments for non-PayPal customers. This is dependant upon the type of account that you created with PayPal.
The prerequisite is that you register with and create an account at PayPal. More detailed information about PayPal is available at www.paypal.com.