How to implement a open connection on Cloud Functios?

How do I implement an open connection that won't close until there's a response from the API I connected to.

I mean to say: I want to send a request to an API and don't want my cloud function to stop running until there's a response from the API.

TL;DR

User is asking how to implement an open connection on Cloud Functions. They are specifically looking for a solution in the Dart language. They mention working with the Paystack payment gateway. One user suggests using asynchronous techniques. User wants to implement a connection that won't close until there's a response from the API they connected to. Solution: Implement asynchronous techniques in Dart to keep the connection open until a response is received from the API.