How to Integrate Bill Desk Payment Gateway

I want to integrate bill desk as a payment gateway and return back on Congratulations page on success or Error page on failure.
I am using ionic 4, angular-cli 6.

Kindly let me know how to do it.

Ionic forum expects you to try to solve your own problem first, as your attempts help us to better understand what you want. Please edit the question to show what you’ve tried, so as to illustrate a specific roadblock you’re running into in a minimal reproducible example.