The cost per transaction for EDI has come way down and many customers want to keep EDI in place because it works.

EDI中每个事务的成本已经下降，许多客户仍然希望保留EDI，因为它仍然能够工作。

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CPT ads " cost per transaction "; you pay only if the customer brought to you from a media sites becomes a paying customer.

CPT广告“ cost per transaction：按成交量计费”；只有浏览者购买你站点广告中的商品之后才计费。

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For example, the network bandwidth, CPU utilization, and disk usage per transaction or application can determine PaaS cost.

例如，每个事务或每个应用程序的网络带宽、CPU 利用率和磁盘利用率可确定 PaaS 的成本。

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With the new partnerships, Foursquare will get paid on a cost-per-transaction basis.

FORBES: Foursquare Inches Toward Profitability With Visa, MasterCard Deals

Furthermore, processing costs are low: about 30 cents per transaction, half the cost of clearing a cheque.

ECONOMIST: Debit cards

Because credit card companies have always charged a swipe fee, one that was paid by retailers per transaction to cover the cost of equipment and processing.

FORBES: New Credit Card Swipe Fee Rules Are Good News For Shoppers