There are different types of payment methods that can be used for e-commerce. The following articles will show them and explain the pros as well as the cons
Micropayment is a transaction involving a very small monetary amount which is mainly used in Business to Consumer/B2C business via Internet.
A purchase order is a mainly commercially used document that gets issued by a buyer to a seller.
PayPal is a web-based application and allows secure payment and money transfer through the Internet.