#import <PayUCheckoutPro/PayUCheckoutPro.h>
#import <PayUCheckoutProBase/PayUCheckoutProBase.h>

PayUPaymentParams *paymentParam = [[PayUPaymentParams alloc] initWithKey:<#(NSString * _Nonnull)#>
                                                           transactionId:<#(NSString * _Nonnull)#>
                                                                  amount:<#(NSString * _Nonnull)#>
                                                             productInfo:<#(NSString * _Nonnull)#>
                                                               firstName:<#(NSString * _Nonnull)#>
                                                                   email:<#(NSString * _Nonnull)#>
                                                                   phone:<#(NSString * _Nonnull)#>
                                                                    surl:<#(NSString * _Nonnull)#>
                                                                    furl:<#(NSString * _Nonnull)#>
                                                             environment:<#(enum Environment)#> /*EnvironmentProduction or EnvironmentTest*/];
​
paymentParam.userCredential = <#(NSString)#>; // For saving and fetching use saved card

    paymentParam.additionalParam = [[NSDictionary alloc] initWithObjectsAndKeys:
                                    <#(NSString)#>, PaymentParamConstant.udf1,
                                    <#(NSString)#>, PaymentParamConstant.udf2,
                                    <#(NSString)#>, PaymentParamConstant.udf3,
                                    <#(NSString)#>, PaymentParamConstant.udf4,
                                    <#(NSString)#>, PaymentParamConstant.udf5,
                                    <#(NSString)#>, HashConstant.paymentRelatedDetailForMobileSDK,
                                    <#(NSString)#>, HashConstant.vasForMobileSDK,
                                    <#(NSString)#>, HashConstant.payment,
                                    nil];

[PayUCheckoutPro openOn:self paymentParam:paymentParam config:<#(PayUCheckoutProConfig * _Nullable)#> delegate:self];

/// This function is called when we successfully process the payment
/// @param response  success response
- (void)onPaymentSuccessWithResponse:(id _Nullable)response {
    
}
​
/// This function is called when we get failure while processing the payment
/// @param response failure response
- (void)onPaymentFailureWithResponse:(id _Nullable)response {
    
}
​
/// This function is called when the user cancel’s the transaction
/// @param isTxnInitiated tells whether payment cancelled after reaching bankPage
- (void)onPaymentCancelWithIsTxnInitiated:(BOOL)isTxnInitiated {
    
}
​
/// This function is called when we encounter some error while fetching payment options or there is some validation error
/// @param error This contains error information
- (void)onError:(NSError * _Nullable)error {
    
}
​
/// Use this function to provide hashes
/// @param param NSDictionary that contains key as HashConstant.hashName & HashConstant.hashString
/// @param onCompletion Once you fetch the hash from server, pass that hash with key as param[HashConstant.hashName]
- (void)generateHashFor:(NSDictionary<NSString *, NSString *> * _Nonnull)param onCompletion:(void (^ _Nonnull)(NSDictionary<NSString *, NSString *> * _Nonnull))onCompletion {
    // Send below string hashStringWithoutSalt to your backend and append the salt at the end and send the sha512 back to us, do not calculate the hash at your client side, for security is reasons, hash has to be calculated at the server side
    NSString *hashStringWithoutSalt = [param objectForKey:HashConstant.hashString];
    // Or you can send below string hashName to your backend and send the sha512 back to us, do not calculate the hash at your client side, for security is reasons, hash has to be calculated at the server side
    NSString * hashName = [param objectForKey:HashConstant.hashName];
    
    // Set the hash in below string which is fetched from your server
    NSString *hashFetchedFromServer = <#(NSString)#>;
    
    NSDictionary *hashResponseDict = [NSDictionary dictionaryWithObjectsAndKeys:hashFetchedFromServer, hashName, nil];
    onCompletion(hashResponseDict);
}