找不到类别'\ Omnipay \ Razorpay \ Gateway'

Question

我添加了

"require":
{ "razorpay/omnipay-razorpay": "dev-master"},

"autoload": {

    "psr-0": { 
        "": "lib/", 
        "Omnipay\\Razorpay\\" : "lib/omnipay/src"
    }
}

在何处以及如何添加“ \ Omnipay \ Razorpay \ Gateway”类