Integration of Payment gateway in IONIC

I need a Ionic expert who can integrate the esewa payment gateway to an Ionic app
Please check the below documentation and let me know if it is possible to integrate it to an Ionic app.
https://developer.esewa.com.np/#/?id=introduction

If you explain me how it can be done, then I will award you the project.

Interested Candidates Please apply.

Thanks,
Karthik