What is Long Polling?
Long Polling is a method of receiving server events by utilizing the HTTP protocol. The client maintains the HTTP request connection, and when an event occurs on the server, it is forwarded to the connected client. If the response time of the request exceeds, the client connects a new request and waits for the server to receive the event. You can understand Long Polling by referring to the figure below.
See the tutorial for receiving events using Long Polling.

How can I make an API request?
Transaction requests are used in various services that utilize [Blockchain Network]. The EQ Hub API documentation for services that require confirmation of transaction results includes content for Long Polling.