How to pass/share user specific data between two different web applications

See more:

C#

.NET

sockets

SignalR

I have two different web applications that need to transfer data between them. After reading about SignalR, I'd like to give this a try but I am not sure if its a good fit. The examples I found not really matches my requirements. I did not find much documentation on how to do this. Any advice on this or about any other framework or library that suits my requirement would be greatly appreciated. Below is the specific information of what I want to achieve

specific Information: Example: Application A - A customer care application that will receive multiple calls(very high traffic) from the customers and also receive their information (Ex: phone number, Name etc)

Application B - A web application that performs some actions using the phone number received from Application A

Assume user logged in to Application A and Application B. when the call comes in with information, user should be able to pass the information(phone number, name etc) received by Application A, to Application B in json body and it should show up on application B's browser.(server to client communication) Using that information User will perform some actions on application B. One more thing is Application A is hosted on multiple servers and is using .Net Core. I dont have information on which technology Application B is using. I read that signalr uses backplane mechanism but I am not sure if I can share the data between the servers without having scaling issues.

Any advice on how to achieve this is greatly appreciated. Thank you!!

What I have tried:

I achieved establishing connection between Server to Client of the same web application. But my issue here is to establish connection between 2 different web applications which are hosted in different multiple servers