1. Build Integration

self.razorpay.getPaymentMethods(withOptions: nil, withSuccessCallback: {methods in
     paymentMethods = methods
    }){ error in
        errorDescription = error
    }
```objectivec: ViewController.m

[razorpay getPaymentMethodsWithOptions: nil withSuccessCallback: ^(NSDictionary *methods){
    for(NSString *key in [methods allKeys]) {
        NSLog(@"%@",[methods objectForKey:key]);
    }
} andFailureCallback: ^(NSString *error){
    NSLog(@"%@",error);
}];

let options :[String:String] = ["subscription_id": "sub_testid"] \\ For subscriptions
var paymentMethods :[AnyHashable:Any] = [:]
var errorDescription: String = ""
self.razorpay.getPaymentMethods(withOptions: options, withSuccessCallback: {methods in
     paymentMethods = methods
    }){ error in
        errorDescription = error
    }

```objectivec: ViewController.m
NSDictionary *options = @{@"subscription_id": @"sub_testid"};

[razorpay getPaymentMethodsWithOptions: options withSuccessCallback: ^(NSDictionary *methods){
    for(NSString *key in [methods allKeys]) {
        NSLog(@"%@",[methods objectForKey:key]);
    }
} andFailureCallback: ^(NSString *error){
    NSLog(@"%@",error);
}];

var errorDescription: String = ""
var amount: UInt64 = 0
self.razorpay.getSubscriptionAmount(havingSubscriptionId: "sub_testid", withSuccessCallback: {subAmount in
        amount = subAmount
    }){ error in
        errorDescription = error
    }
```objectivec: ViewController.m
[razorpay getSubscriptionAmountWithHavingSubscriptionId:@"sub_testid" withSuccessCallback:^(UInt64 amount){
    NSLog(@"%lld",amount);
}andFailureCallback: ^(NSString *error){
    NSLog(@"%@",error);
}];

let options: [String:Any] = [
            "amount": 100, // amount in currency subunits. Defaults to INR. 100 = 100 paise = INR 1. We support more than 92 currencies.
            "currency": "INR",//We support more that 92 international currencies.
            "email": "gaurav.kumar@example.com",
            "contact": "9090980808",
            "order_id": "order_DBJOWzybf0sJbb",//From response of Step 3
            "method": "card",
            "card[name]": "Gaurav Kumar",
            "card[number]": "4386289407660153",
            "card[expiry_month]": 06,
            "card[expiry_year]": 30,
            "card[cvv]": "123"
        ]
razorpay.authorize(options)
```objectivec: ViewController.m
NSDictionary *options = @{
                 @"amount": @"100", // amount in currency subunits. Defaults to INR. 100 = 100 paise = INR 1. We support more than 92 currencies.
                 @"currency": @"INR",////We support more that 92 international currencies.
                 @"email": @"gaurav.kumar@example.com",
                 @"contact": @"9797979797",
                 @"order_id": @"order_4xbQrmEoA5WJ0G",
                 @"method": @"wallet",
                 @"wallet": @"mobikwik"
             };

let options: [AnyHashable:Any] = [
    "amount": "100", // amount in paise
    "currency": "INR",
    "email": "a@b.com",
    "contact": "1234567890",
    "method": "upi",
    "flow": "intent"
]
self.razorpay?.authorize(options)

NSDictionary *options = @{
    @"amount": @"100", // amount in paise
    @"currency": @"INR",
    @"email": @"a@b.com",
    @"contact": @"1234567890",
    @"method": @"upi",
    @"flow": @"intent"
};
[razorpay authorize:options];

override func viewDidLoad() {
    super.viewDidLoad()
    .
    .
    self.webView.navigationDelegate = self
}

public func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!){
    if razorpay != nil{
        self.razorpay.webView(webView, didCommit: navigation)
    }
}

public func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError er: Error) {
    if razorpay != nil{
        self.razorpay.webView(webView, didFailProvisionalNavigation: navigation, withError: er)
    }
}

public func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError er: Error){
    if razorpay != nil{
        self.razorpay.webView(webView, didFail: navigation, withError: er)
    }
}

public func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!){
    if razorpay != nil{
        self.razorpay.webView(webView, didFinish: navigation)
    }
}

```objectivec: ViewController.m

override func viewDidLoad(){
    super.viewDidLoad();
    .
    .
    webView.navigationDelegate = self;
}

- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation{
    if (razorpay){
        [razorpay webView:webView didCommit:navigation];
    }
}

- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error{
    if (razorpay){
        [razorpay webView:webView didFailProvisionalNavigation:navigation withError:error];
    }
}

- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error{
    if (razorpay){
        [razorpay webView:webView didFail:navigation withError:error];
    }
}

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
    if (razorpay){
        [razorpay webView:webView didFinish:navigation];
    }
}

func onPaymentError(_ code: Int32, description str: String, andData response: [AnyHashable : Any]){
    let alertController = UIAlertController(title: "FAILURE", message: str, preferredStyle: UIAlertControllerStyle.alert)
    let cancelAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
    alertController.addAction(cancelAction)
    //self.view = view that controller manages
    self.view.sendSubview(toBack: self.webView)
    navBar.isHidden = true
    navBar.isUserInteractionEnabled = false
    self.view.window?.rootViewController?.present(alertController, animated: true, completion: nil)
    self.razorpay = nil
}

func onPaymentSuccess(_ payment_id: String, andData response: [AnyHashable : Any]){
    let alertController = UIAlertController(title: "SUCCESS", message: "Payment Id \(payment_id)", preferredStyle: UIAlertControllerStyle.alert)
    let cancelAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
    alertController.addAction(cancelAction)
    //self.view = view that controller manages
    self.view.sendSubview(toBack: self.webView)
    navBar.isHidden = true
    navBar.isUserInteractionEnabled = false
    self.view.window?.rootViewController?.present(alertController, animated: true, completion: nil)
    self.razorpay = nil
}

//MARK: Action functions
@IBAction func cancel(_ sender: Any){

    let alertController = UIAlertController(title: "Cancel Transaction", message: "Are you sure you want to cancel the current transaction ? The page will go back to the checkout page, where you can choose another payment option", preferredStyle: UIAlertControllerStyle.alert)

    let cancelAction = UIAlertAction(title: "Do Not Cancel", style: UIAlertActionStyle.cancel, handler: nil)
    let okayAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.destructive, handler: { action in
        self.razorpay.userCancelledPayment()
        } )

    alertController.addAction(cancelAction)
    alertController.addAction(okayAction)

    self.view.window?.rootViewController?.present(alertController, animated: true, completion: nil)
}
```objectivec: ViewController.m

- (void)onPaymentError:(int)code description:(nonnull NSString *)str andData:(NSDictionary *)response {

    [self.view sendSubviewToBack:webView];
    navbar.hidden = true;
    navbar.userInteractionEnabled = false;
    razorpay = nil;

    [[[UIAlertView alloc] initWithTitle:@"Error"
                                message:str
                               delegate:self
                      cancelButtonTitle:@"OK"
                      otherButtonTitles:nil] show];
}

- (void)onPaymentSuccess:(nonnull NSString *)payment_id andData:(NSDictionary *)response {

    [self.view sendSubviewToBack:webView];
    navbar.hidden = true;
    navbar.userInteractionEnabled = false;
    razorpay = nil;

    [[[UIAlertView alloc] initWithTitle:@"Payment Successful"
                                message:payment_id
                               delegate:self
                      cancelButtonTitle:@"OK"
                      otherButtonTitles:nil] show];

}

-(void) cancel:(id)sender{

    [[[UIAlertView alloc] initWithTitle:@"Payment Cancelled" message:@"You cancelled the payment. Please retry or let us know at your-help-email@your-domain.com in case of any difficulty." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil] show];

    [self onPaymentError:-1 description:@"User Cancelled Payment" andData:@{}];

    [razorpay userCancelledPayment];

}

{
  "razorpay_payment_id": "pay_29QQoUBi66xm2f",
  "razorpay_order_id": "order_9A33XWu170gUtm",
  "razorpay_signature": "9ef4dffbfd84f1318f6739a3ce19f9d85851857ae648f114332d8401e0949a3d"
}

RazorpayClient razorpay = new RazorpayClient("[YOUR_KEY_ID]", "[YOUR_KEY_SECRET]");

String secret = "EnLs21M47BllR3X8PSFtjtbd";

JSONObject options = new JSONObject();
options.put("razorpay_order_id", "order_IEIaMR65cu6nz3");
options.put("razorpay_payment_id", "pay_IH4NVgf4Dreq1l");
options.put("razorpay_signature", "0d4e745a1838664ad6c9c9902212a32d627d68e917290b0ad5f08ff4561bc50f");

boolean status =  Utils.verifyPaymentSignature(options, secret);

```php: PHP
$api = new Api($key_id, $secret);

$api->utility->verifyPaymentSignature(array('razorpay_order_id' => $razorpayOrderId, 'razorpay_payment_id' => $razorpayPaymentId, 'razorpay_signature' => $razorpaySignature));

```ruby: Ruby
require "razorpay"
Razorpay.setup('YOUR_KEY_ID', 'YOUR_SECRET')

payment_response = {
       razorpay_order_id: 'order_IEIaMR65cu6nz3',
       razorpay_payment_id: 'pay_IH4NVgf4Dreq1l',
       razorpay_signature: '0d4e745a1838664ad6c9c9902212a32d627d68e917290b0ad5f08ff4561bc50f'
     }
Razorpay::Utility.verify_payment_signature(payment_response)

```python: Python
import razorpay
client = razorpay.Client(auth=("YOUR_ID", "YOUR_SECRET"))

client.utility.verify_payment_signature({
  'razorpay_order_id': razorpay_order_id,
  'razorpay_payment_id': razorpay_payment_id,
  'razorpay_signature': razorpay_signature
  })

```c: .NET
RazorpayClient client = new RazorpayClient("[YOUR_KEY_ID]", "[YOUR_KEY_SECRET]");

Dictionary options = new Dictionary();
options.Add("razorpay_order_id", "order_IEIaMR65");
options.Add("razorpay_payment_id", "pay_IH4NVgf4Dreq1l");
options.Add("razorpay_signature", "0d4e745a1838664ad6c9c9902212a32d627d68e917290b0ad5f08ff4561bc50");

Utils.verifyPaymentSignature(options);

```nodejs: Node.js
var instance = new Razorpay({ key_id: 'YOUR_KEY_ID', key_secret: 'YOUR_SECRET' })

var { validatePaymentVerification, validateWebhookSignature } = require('./dist/utils/razorpay-utils');
validatePaymentVerification({"order_id": razorpayOrderId, "payment_id": razorpayPaymentId }, signature, secret);

```Go: Go
import ( razorpay "github.com/razorpay/razorpay-go" )
client := razorpay.NewClient("YOUR_KEY_ID", "YOUR_SECRET")

params := map[string]interface{}{
 "razorpay_order_id": "order_IEIaMR65cu6nz3",
 "razorpay_payment_id": "pay_IH4NVgf4Dreq1l",
}

signature := "0d4e745a1838664ad6c9c9902212a32d627d68e917290b0ad5f08ff4561bc50f";
secret := "EnLs21M47BllR3X8PSFtjtbd";
utils.VerifyPaymentSignature(params, signature, secret)

NSAppTransportSecurity

    NSAllowsArbitraryLoads