Integration

Technical integration of iOS UPI SDK with the app

Cocoapods integration

Add the following lines into your Podfile

// make sure to add below-mentioned line to use dynamic frameworks
use_frameworks!

// Add this to include our SDK
pod 'PayUIndia-UPI'

Swift Package Manager Integration

You can integrate PayUIndia-UPIKit, PayUIndia-UPICoreKit with your app or SDK in two ways:

1. Via Xcode - Go to File-> Add Package-> https://github.com/payu-intrepos/payu-upi-ios-sdk

2. Via Package.Swift - Add below line in Package.swift dependencies

.package(name: "PayUIndia-UPI", url: "https://github.com/payu-intrepos/payu-upi-ios-sdk", from: "6.1.0")

UPICore

You can integrate UPI Collet and UPIIntent with your own UI using UPICore

Cocoapods integration

Add the following lines into your Podfile

// make sure to add below-mentioned line to use dynamic frameworks
use_frameworks!

// Add this to include our SDK
pod 'PayUIndia-UPICore'

Swift Package Manager Integration

You can integrate PayUIndia-UPIKit, PayUIndia-UPICoreKit with your app or SDK in two ways:

1. Via Xcode - Go to File-> Add Package-> https://github.com/payu-intrepos/payu-upi-ios-sdk
2. Via Package.Swift - Add below line in Package.swift dependencies

.package(name: "PayUIndia-UPICore", url: "https://github.com/payu-intrepos/payu-upi-ios-sdk", from: "6.1.0")

Make UPI Payments

1. Set environment to test or production. You can also set debugging level to get logs from the SDK

   PayUUPICore.shared.environment = .production
   PayUUPICore.shared.logLevel = .error //Other option is verbose. Logs are disabled by default

2. Set mandatory payment parameters required for the payment, please import PayUParamsKit

         let paymentParams = PayUPaymentParam(
               key: "ibibogames", //Your merchant key for the current environment
               transactionId: randomString(length: 6), //Your unique ID for this trasaction
               amount: self.amountTextField.text ?? "1", //Amount of transaction
               productInfo: "iPhone", // Description of the product
               firstName: "Vipin", // First name of the user
               email: "[e-mail]", // Email of the useer
               phone: "9123456789", // "10 digit phone number here"
               surl: "https://payu.herokuapp.com/ios_success", // Success URL. Not used but required due to mandatory check in API.
               furl: "https://payu.herokuapp.com/ios_failure", // Failure URL. Not used but required due to mandatory check in API.
               environment: .production // Production or Test . Not used but required due to mandatory parameter.
           )
           //User defined parameters.
           //You can save additional details with each txn if you need them for your business logic.
           //You will get these details back in payment response and transaction verify API
           //Like, you can add SKUs for which payment is made.
           //You can keep all udf fields blank if you do not have any requirement to save your custom txn specific data at PayU's end
           paymentParams.udfs = PayUUserDefines()
           paymentParams.udfs?.udf1 = ""
           paymentParams.udfs?.udf2 = ""
           paymentParams.udfs?.udf3 = ""
           paymentParams.udfs?.udf4 = ""
           paymentParams.udfs?.udf5 = ""
           paymentParams.userCredential = "yIlrx4:[e-mail]" // "merchantKey:user'sUniqueIdentifier"
           let upi = UPI()​
           upi.beneficiaryAccountNumber = accNoTextField.text //for tpv transaction
           upi.beneficiaryAccountIFSC = ifscTextField.text​//for tpv transaction
           paymentParams.paymentOption = upi

3. Set callbacks to receive actionable events from SDK

   1. paymentCompletion - You receive the payment response here.

      PayUUPICore.shared.paymentCompletion = { [weak self] result in
              DispatchQueue.main.async { [weak self] in
                  guard let self = self else {return}
                  self.navigationController?.popToRootViewController(animated: false)
      
                  switch result {
                  case .success(let response):
                      Helper.showAlert(String(describing: response), onController: self)
      
                  case .failure(let error):
                      Helper.showAlert(String(describing: error.rawValue), onController: self)
                  }
              }
      }

   2. backPressed - If user has not yet initiated the transaction and she presses back button from the UPI payment options page, this callback is triggered. You can dismiss SDK's UI screen here.

      PayUUPICore.shared.backPressed = {[weak self] in
          self?.navigationController?.popToRootViewController(animated: true)
      }

   3. onEnteringVPA - For validating the VPA entered by the user, we need to hit PayU's validate VPA api. This api needs hash. In this callback, you will get the vpa entered by the user. Use this value to generate required hash. When the hash is received from your server, send us the updated post params with the new hash.

      PayUUPICore.shared.onEnteringVPA = {[weak self] vpa, completion in
          guard let self = self else { return }
      
          (self.paymentParams?.paymentOption as? UPI)?.vpa = vpa
          self.fetchHashes(withParams: self.paymentParams!) { result in
              switch result {
              case .success:
                  completion(.success(self.paymentParams!))
              case .failure(let error):
                  print("Could not fetch hashes \(error.description)")
                  completion(.failure(.noInternet()))
              }
          }
      }

4. Fetch hashes and save them in paymentParams object

   • You need to set hashes property in paymentParams. Hashes authenticates that API request originates from the original source and not from any Man in the middle. Property hashes is of type PPKHashes

   • PPKHashes has 3 properties. Each of these 3 is used for a distinct API call. These 3 properties are defined below:

     1. paymentOptionsHash: This is required to get available upi payment options from which payment can be made.

     2. paymentHash: This is required to create transaction at PayU's end.

     3. validateVPAHash: This is required by validateVPA API in upi collect flow to check if provided VPA is registered with a bank account and is active or not. Not required in intent transactions.

   • You need to provide first 2 hashes before asking SDK to initiate the payment. Hashes must be generated only on your server as it needs a secret key (also known as salt). Your app must never contain salt.

   • Please see this documentation to generate hashes on your server.

     • Command and var1 values for generating paymentRelatedDetailsForMobileSDKHash & validateVPAHash are given below

     • Hash for param	Command	var1
       paymentOptionsHash	payment_related_details_for_mobile_sdk	value of userCredentials (You have set it in paymentParams)
       validateVPAHash	validateVPA	vpa string of your user

5. After setting value of hashes in paymentParams, call following method of class PayUAPI to get all available payment options to the you, "Merchant" :

   class func getUPIPaymentOptions(withPaymentParams params: PayUPaymentParams,
                                  completion: @escaping(Result<PayUUPIPaymentOptions, PayUSDKError>) ->() )

   You will get a response of type Result with the value of type PayUUPIPaymentOptions in response's success param. Sample code shown below

    PayUAPI.getUPIPaymentOptions(withPaymentParams: self.paymentParams!, completion: { [weak self] result in
        switch result {
        case .success(let paymentOptions):
            self?.availablePaymentOptions = paymentOptions
            completion(.success(true))
        case .failure(let error):
            print(error)
            completion(.failure(error))
        }
    })

6. With the PayUUPIPaymentOptions object received above, you can populate relevant UPI options on your checkout screen. As stated at the beginning of this document, you have three options to make payment 1. Intent 2. UPI Collect 3. Fallback for Google Pay

   Inside intent key of PayUUPIPaymentOptions object, you get array of objects of type PayUSupportedIntentApp. These are essentially the apps which are supported by the SDK for intent payments. You can now query the SDK for payment options available for the "Current User" based on factors like if Bank/Payment-Service-Provider(PSP) apps are installed on the current user's device or not.

    public class func canUseIntent(forApp app: PayUSupportedIntentApp,
                   withUpiOptions options: PayUUPIPaymentOptions) -> Bool
    public class func canUseUpiCollect(withPaymentOptions options: PayUUPIPaymentOptions) -> Bool
    public class func canUseGpayOmni(withPaymentOptions options: PayUUPIPaymentOptions) -> Bool
    public class func canUseGpayCollect(withPaymentOptions options: PayUUPIPaymentOptions) -> Bool

   Based on your priority and availability of payment options for the current user, you can order the payment options on your checkout page. Note: canUseGpayOmni and canUseGpayCollect methods give you fallback options of Google Pay intent app which have approx 10% more success rate than general UPI collect payments . This means, if your user does not have Google Pay app installed, you can still show Google Pay option on your checkout and we will display these two fallback options upon Google pay selection by the user. Google Pay omni payment option takes user's phone number for UPI collect payment.

7. If user selects intent app option, you need to create an instance of PayUIntentPaymentVC and following data to it.

    let paymentVC = PayUIntentPaymentVC()
    paymentVC.availableUpiOptions = upiOptions
    paymentVC.paymentApp = app //object of type 'PayUSupportedIntentApp'
    paymentVC.paymentParams = params
   
    navigationController?.pushViewController(paymentVC, animated: false)

8. If user selects upi collect option or Google Pay fallback option, you need to create an instance of PayCollectPaymentVC by following code convenience method

    let collectVC = PayCollectPaymentVC()

   Then, you should pass following information for payment processing

    collectVC.paymentParams = params
    collectVC.screenType = type // .upi or .gpayFallback
    collectVC.availablePaymentOptions = upiOptions
   
    self.navigationController?.pushViewController(collectVC, animated: true)

   After the payment is done, you should get the resonse in your payment completion callback defined above PayUUPICore.shared.paymentCompletion

9. Add the query schemes in info.plist

   <key>LSApplicationQueriesSchemes</key>
   <array>
   <string>phonepe</string>
   <string>tez</string>
   <string>paytm</string>
   </array>

10. Make payment through UPICore:

i) UPI Collect Flow:

Validate vpa with paymentparam, it will give you a callback once it has verified vpa in the completion block.

PayUAPI.validateVPA(withPaymentParams: <PayUPaymentParam>, completion: <(Result<PayUValidateVPAModel, PayUError>) -> ()>)

Begin payment after validating your VPA. Set up PayUPaymentResponseHandler when the payment is successfully initiated and handle the response after the payment is completed.

PayUAPI.getDataForUPICollectPayment(withPaymentParams: <PayUPaymentParam>, completion: <(Result<PayUPureS2SModel, PayUError>) -> ()>)

ii) UPI Intent Flow:

First check which intent app are in current device(Gpay, Paytm, Phonepe). Then initiate payment

a) Gpay Intent Flow:

First get data using below function

PayUAPI.getDataForGpayIntentPayment(withPaymentParams: <PayUPaymentParam>, completion: <(Result<PayUPureS2SModel, PayUError>) -> ()>)

then make payment using below function and wait for response.

PayUThirdPartyManager.makePayment(withApp: <PayUSupportedIntentApp>, withIntentModel: <PayUPureS2SModel>, appSwitchingStatus: <((Bool) -> ())((Bool) -> ())(Bool) -> ()>)

b) Other Intent Flow:

First get data using below function

PayUAPI.getDataForIntentPayment(withPaymentParams: <PayUPaymentParam>, completion: <(Result<PayUPureS2SModel, PayUError>) -> ()>)

then make payment using below function and wait for response.

PayUThirdPartyManager.makePayment(withApp: <PayUSupportedIntentApp>, withIntentModel: <PayUPureS2SModel>, appSwitchingStatus: <((Bool) -> ())((Bool) -> ())(Bool) -> ()>)

You will get Socket model using PayUPersistentStore.getSocketConnectionModel().