How can I integrate this payment getway with “OpenCart” shopping cart website.?
I think you got us slightly wrong. We are not a payment gateway provider, but a SaaS based ecommerce platform called Zepo. We help entrepreneurs and designers open their own online stores through our platform. We just offer the free PayTM gateway with our online stores.
Sorry if we miscommunicated. Let us know if there is any other way we can help you.