Enable verify API and Web hook call

Webhooks are one of a few ways web applications can communicate with each other. It allows you to send real-time data from one application to another whenever a given event occurs.

 

https://www.getvero.com/resources/webhooks/ 

Webhooks are used in the style of API where the server pushes, or streams, data to the client. The client does not have to make repeated requests to the server. This push/streaming architectural style of API is well suited to use cases where the underlying data is refreshing itself constantly, such as a stock ticker or a social activity stream.

In a nutshell, a Webhook is a different approach from your typical Web API. As opposed to the usual RESTful API deployment where a server hosts an HTTP-based API Endpoint that clients (the "API consumers") pull data from one request at a time, Webhooks reverse the direction of the conversation. It is the client that hosts an HTTP-based API endpoint to which the server pushes data as it becomes available. That endpoint is known as a webhook.

 

Check this for more details

https://www.programmableweb.com/news/what-webhooks-push-styled-api-and-how-does-it-work/analysis/2017/03/28 

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