Set up the payment hashes

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(Mandatory Step)
For details on static and dynamic hashes check here. 
Passing static hashes
For passing static hashes during integration, use below code:
Swift
Objective-C
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paymentParam.additionalParam[HashConstant.paymentRelatedDetailForMobileSDK] = <#T##String#>
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paymentParam.additionalParam[HashConstant.vasForMobileSDK] = <#T##String#>
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paymentParam.additionalParam[HashConstant.getEmiAmountAccordingToInterest] = <#T##String#>
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paymentParam.additionalParam[HashConstant.eligibleBinsForEMI] = <#T##String#>
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paymentParam.additionalParam[HashConstant.deleteUserCard] = <#T##String#>
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paymentParam.additionalParam[HashConstant.payment] = <#T##String#>
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​
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    paymentParam.additionalParam = [[NSDictionary alloc] initWithObjectsAndKeys:
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                                    <#(NSString)#>, HashConstant.paymentRelatedDetailForMobileSDK,
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                                    <#(NSString)#>, HashConstant.vasForMobileSDK,
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                                    <#(NSString)#>, HashConstant.getEmiAmountAccordingToInterest,
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                                    <#(NSString)#>, HashConstant.eligibleBinsForEMI,
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                                    <#(NSString)#>, HashConstant.deleteUserCard,
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                                    <#(NSString)#>, HashConstant.payment,
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                                    nil];
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Passing dynamic hashes 
For passing dynamic hashes, merchant will receive a call on the method generateHash of PayUCheckoutProListener.
In the method parameter you will receive a dictionary or hashMap, extract the value of hashString from that. Pass that value to server, now server will append salt at the end and generate sha512 hash over it. Server will give that hash back to your app and app will give that hash to us via callback mechanism.
For passing dynamic hashes during integration, use below code:
Swift
Objective-C
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/// Use this function to provide hashes
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/// - Parameters:
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///   - param: Dictionary that contains key as HashConstant.hashName & HashConstant.hashString
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///   - onCompletion: Once you fetch the hash from server, pass that hash with key as param[HashConstant.hashName]
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func generateHash(for param: DictOfString, onCompletion: @escaping PayUHashGenerationCompletion) {
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    // Send this string 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
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    let hashStringWithoutSalt = param[HashConstant.hashString] ?? ""
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    // 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
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    let hashName = param[HashConstant.hashName] ?? ""
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​
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    // Set the hash in below string which is fetched from your server
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    let hashFetchedFromServer = <#T##String#>
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    onCompletion([hashName : hashFetchedFromServer])
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}
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/// Use this function to provide hashes
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/// @param param NSDictionary that contains key as HashConstant.hashName & HashConstant.hashString
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/// @param onCompletion Once you fetch the hash from server, pass that hash with key as param[HashConstant.hashName]
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- (void)generateHashFor:(NSDictionary<NSString *, NSString *> * _Nonnull)param onCompletion:(void (^ _Nonnull)(NSDictionary<NSString *, NSString *> * _Nonnull))onCompletion {
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    // 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
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    NSString *hashStringWithoutSalt = [param objectForKey:HashConstant.hashString];
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    // 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
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    NSString * hashName = [param objectForKey:HashConstant.hashName];
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    // Set the hash in below string which is fetched from your server
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    NSString *hashFetchedFromServer = <#(NSString)#>;
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    NSDictionary *hashResponseDict = [NSDictionary dictionaryWithObjectsAndKeys:hashFetchedFromServer, hashName, nil];
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    onCompletion(hashResponseDict);
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}
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Here,
            param -> Dictionary that contains key as HashConstant.hashName & HashConstant.hashString
            onCompletion -> Once you fetch the hash from server, pass that hash with key as param[HashConstant.hashName]
Getting Hash Data to calculate hash
Checkout Pro SDK will give a callback in generateHash() method whenever any hash is needed by it. Merchant need to calculate that hash and pass back to the SDK. Below is the process of doing so: 
To extract hash string and hash name from dictionary received in generateHash() method, use below keys - 
HashConstant.hashString -> This will contain complete hash string excluding salt. Merchant can append their salt at end of hash string to calculate the hash. 
HashConstant.hashName -> This will contain hash name. 
Passing generated hash to SDK
Prepare a dictionary, where key should be param[HashConstant.hashName] and value should be generated hash value and pass this dictionary in onCompletion() .
Advanced Integration
Convenience Fee Integration
Last modified 6mo ago
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Contents
Passing static hashes
Passing dynamic hashes
Getting Hash Data to calculate hash
Passing generated hash to SDK