PayPal has announced the release of a new PayPal Invoicing API, which aims to provide small businesses with the tools necessary to easily create, send, and process invoices. Although targeting small businesses, the company has noted that the API has a global reach.
Amazon has cemented itself as a top tier option for charging users thanks to its Amazon Flexible Payments Service API. The crowd-funding site Kickstarter has run hundreds of millions through the API, so it should also get some credit. Although, at Amazon, Kickstarter may get blame instead, having inspired many other sites, which eventually caused Amazon to turn away sites with similar concepts.