Best way to push rasa response to bot!


I have been working on a project on RASA, and in the course of my work, I have a requirement where a response should come to the bot, based on some payment done on different website. Though the payment process is initiated from the bot, but the actual payment is done on a different website.

Now, as my understanding goes, this can be achieved by Server push method. Now, my question is, how to implement that in my custom webchat? Any help is appreciated.

Thanks in advance