The ePay Payment Solutions API allows to integrate payments into web services in SOAP protocol. Originally from Denmark, ePay additionally provides invoicing and subscription alternatives. To read documentation, visit http://tech.epay.dk/en/payment-web-service
Eleven APIs have been added to the ProgrammableWeb directory under the Home Automation, Marketing, Payments, and Healthcare categories, among others. Featured today is an API for open source smarthome automation system Domoticz. Have a look at the new additions in this summary.