The InvoiceNinja API integrates invoicing and emailing into web services, providing clientID, page, and serializer as optional methods. JSON format is available for callbacks with PHP SDK as an API facilitator.
Sixteen APIs have been added to the ProgrammableWeb directory in categories including Microservices, Music, Transportation, and Database. One highlight today is the IBM Watson Discovery REST API, for querying data and connecting with other IBM Watson APIs. Here's a rundown of the latest additions.