How to do chatting in two apps

Discuss
#1

I have two apps for the client and serviceman so I want to do add a screen for chatting . But the problem is there are two apps and I only know the coding of making chatting possible in only one app the receiver and the sender are both in one app. but here the sender and the receiver are v in two apps one for the sender and one for the receiver so please help me.:relaxed::relaxed::relaxed::relaxed:

#2

If you can do this

Then you can easily do this also

You can use firebase to store the massages and show to the receiver

#3

create a app use firebase or other data to store and show msg.
in this send and receiver are same database connected so there is no problem.

#4

This one can be help to you:

#5