Landing back to ionic app from server

Hello guys, I am using ionic with nodejs as server and hitting a payment gateway from server. When i get back to my server from payment gateway, i don’t know then how to hit ionic app from server back. For testing i used localhost 8100, but after publishing what to do. Please help me resolving this. I dig a lot but didn’t get luck.

After looking a lot of resources, I found a plugin named ‘custom-Url-scheme’ that helped me to resolve this issue. Here is the git repository -