How to integrate paytm payment gateway in ionic 3?

I need to integrate paytm payment gateway in my ionic3 app. Is anyone allready did this one please explain how to integrate these are things in my ionic 3 project.

Iam visited these are things and tried nothing is useful to achieve.

https://forum.ionicframework.com/t/how-to-integrate-paytm-payment-gateway-in-ionic-3/133939

https://github.com/adviraj/ionic-native-paytm/blob/master/README.md

https://stackoverflow.com/questions/32887340/paytm-integration-in-ionic

http://paywithpaytm.com/developer/discussion/topic/paytm-integration-with-an-ionic-app/

Any help is greately appreciated.