Need Suggestions for New App development( Shopping cart with Real Time chat)

Dear All,

I am Technologist, I Have an idea and I want to develop it,but I am not getting right path where to go and how to start, so please guide me if I am wrong. Below is Concept which I want to achieve

Android App:
App Theme: Shopping cart which include Real time chat.

So my question is I can ask developers to make shopping cart system but for real time chat I want to buy script or something which I can integrate with my shopping cart,

So buyer can chat with seller like we chat in LINE or whatsap or in viber, but if 10 buyers is chatting with1 Seller how about performance, and if the site have 100 Sellers and it take so much load.

Please suggest to solve this issue, I saw TextOne app, can we buy this app and Integrate with out mobile app ?

my point is I want to use Readymade chat app which support high numbers and scalable or if you can suggest me something new.

I do not think there is

I do not think there is something available of the self that you can use for the purpose you want yet.
It looks like it is very specific.

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