The Tranksbank Java SDK integrates wallet functionalities with third-party applications. This package supports Transbank Webpay for credit card transactions and Onepay for mobile transactions. Java 1.7+ is required.
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.