Possibility of async/await

Problem/Motivation

Previously I posted a feature request if HTTP client manager with ECA can be used together to communicate with an external API i.e. run HTTP request(s) (reactions) from local site (events). This was a really cool implementation!

Now, that was one way. Is it possible to have another feature enhancement. To be able to communicate in both ways with an external API. A simple example is communicating with a payment gateway. When local site submits a payment request, payment gateway responds with a code telling the payment is successful. When local site receives this code, it will update the node accordingly (like changing a field select list to 'Paid' or some sort). Maybe a try/catch block too. If the external API takes too long to respond.

Steps to reproduce

As in description.

Proposed resolution

To have a two-way communication with external API.

Remaining tasks

Develop a two-way communication with external API.

User interface changes

Maybe in ECA?

API changes

Not sure on this.

Data model changes

Not sure on this.