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Cashier-as-a-Service (CaaS) refers to using a third party service as payment. When a shopper buys merchandise online, oftentimes, the shopper does not pay the merchant directly, but rather through a third party - the cashier. The cashier is trusted by both the shopper and the merchant and is expected to allow for reliable and secure transfer of money. By paying a merchant through a cashier, shoppers are able to pay for merchandise without giving away their financial information to the merchants. ==Shopping Online== When using CaaS, shopping online involves three parties - the shopper, merchant, and CaaS. The shopper is the user who adds items to the shopping cart and pays the merchant for the items. The merchant sells merchandise from a website. To sell merchandise, the merchant must provide a way for shoppers to add items to the shopping cart, provide a way for the shopper to pay the merchant, and keep track of customer information. Popular open source merchant software include nopCommerce and Interspire, which provide this functionality and integration of several different CaaS. The CaaS provides a method for the shopper to pay the merchant. Examples of popular CaaS include PayPal, Amazon Payments, Google Wallet, and Venmo. 〔http://research.microsoft.com/en-us/um/people/shuochen/caas/supp/〕 〔http://channel9.msdn.com/posts/Web-Security-Cashier-as-a-ServiceCaas-and-How-to-Shop-for-Free-Online〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cashier-as-a-Service」の詳細全文を読む スポンサード リンク
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