This is a third party SDK in PHP language for Bing Ads API. The API offers web services to organize advertising campaigns, accounts, and reports. It also allows to monitor campaign performance. Developers who prefer to work with PHP language can benefit from this kit available on GitHub.
Webhooks offer a far more efficient way to monitor changes to an endpoint than traditional polling. In this recent article on InfoWorld, Mark Geene discusses the technology and highlights three commercial implementations that put it to good use to improve the customer experience.