Hello I am Priyanka.
The bottom line is that the answer to your question depends on the type of mobile coupons you want to use. On one side of the spectrum you have static mobile coupons that you can send to subscribers via text message or voice message. People just have to show the text to a person at the store to verify participation in the coupon program. This works great at events or other places where the goal is just as much traffic as possible. No integration with the POS needed.

A second type of mobile coupon, dynamic, distributes a unique code to every single campaign participant. Again, no integration with POS needed, but the ability to track the campaign success improves as coupon codes tracked to individual users can be verified at the point of sale (without being integrated).

https://www.quora.com/How-does-the-technology-that-powers-mobile-coupons-work-is-there-a-need-for-integration-with-the-POS

For further queries you can consult me.