Not getting Razor pay Signature and Order ID in iOS

Question

I have integrated the code of Razor pay, but after adding Order_id which I got from Web service Response, I am just getting Payment Id, but not getting Razor pay Signature.

Here is my code:

var razorpayObj : RazorpayCheckout? = nil
let razorpayKey = ""

//RazorpayPaymentCompletionProtocolWithData:
razorpayObj = RazorpayCheckout.initWithKey(razorpayKey, andDelegateWithData: self)

let options: [String:Any] = [
    "prefill": [
        "contact": "",
        "email": ""],
    "image": image,
    "amount" : amount, // 100 rs - 1 rs
    "name": name,
    "order_id" : OrderId,
    "theme": [
        "color": "#01A6F6"
    ]
]

if let rzp = self.razorpayObj {
    rzp.open(options)
    
} else {
    print("Unable to initialize")
}

extension HomeVC : RazorpayPaymentCompletionProtocolWithData {
    
    func onPaymentError(_ code: Int32, description str: String, andData response: [AnyHashable : Any]?) {
        print("error: ", code, str)
        self.presentAlertJustMsg(withTitle: "", message: str)
    }
    
    func onPaymentSuccess(_ payment_id: String, andData response: [AnyHashable : Any]?) {
        print("success: ", payment_id)
        print("Response is: ", (String(describing: response)))
        let paymentId = response?["razorpay_payment_id"] as! String
        let rezorSignature = response?["razorpay_signature"] as! String
        print("rezorSignature", rezorSignature)
        print(" paymentId", paymentId)
        self.presentAlertJustMsg(withTitle: "", message: "Payment Succeeded")
    }
}