How to integrate razorpay payment gateway in laravel without using any package?

I want to integrate razorpay on my laravel project.I use it first time. I have no experience on this. I have my chechout page there is two radio button 1.online 2. Cod , After checking online when click on place order I want to redirect on razor pay payment gateway. How to do that? could someone help me!

Thanks in advance!

via Chebli Mohamed