Learn about the Flow REST API asynchronous request-response model.
The REST API works asynchronously. Unlike other NLP APIs, it will not return a direct reply to a send message request.
Need a synchronous response?
See the Synchronous responses guide to learn about an optional synchronous reply mode supported by certain endpoints.
The below images represent the request-response model.
Instead, the API will respond by sending a POST request to your configured webhook url whenever an event takes place.