Paytm Integration in Swift

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More about InnovationM Admin
  InnovationM Admin
  6 Mar 19

This blog is about how to integrate Paytm with the iOS App.

Steps to integrate paytm via SDK

1. Import the library :

A library can be imported by two process :

a) Via pods

  • Add pod ‘Paytm-Payments’ in the pod file.
  • Run ‘pod install’ from terminal.
  • Now open the xcworkspace
  • Go to “Link Binary With Libraries” in the “Build Phases” in the project settings, and add SystemConfiguration.framework
  • Now Check if PaytmSDK.framework is added in both “Link Binary With Libraries” and “Embedded Binaries”. If not, add by clicking on the plus icon

b) Via direct add library to the project

  • Download SDK from the https://github.com/Paytm-Payments/Paytm_iOS_App_Kit/tree/master/Swift
  • Add Paytm.framework to the project
  • Go to “Link Binary With Libraries” in the “Build Phases” in the project settings, and add SystemConfiguration.framework
  • Now Check if PaytmSDK.framework is added in both “Link Binary With Libraries” and “Embedded Binaries”. If not, add by clicking on the plus icon

2. Add PaytmSDK to ViewController

import PaymentSDK

3. Generate Checksum

Checksumhash is a unique id used by the paytm to ensured that the transaction has not been tempered. Checksumhash has been generated from serverside.

4. Start the payment process

A transaction can be done via the following process

  1. Firstly choose the paytm server based on the environment. For Staging Create an instance of the  PGServerEnvironment and set the serverType to eServerTypeStaging. For Production Create an instance of the  PGServerEnvironment and set the serverType to eServerTypeProduction.
  2. Now create the PGOrder instance with all the parameters.
  3. Create the PGTransactionViewController instance by calling initTransactionForOrder and pass the instance of PGOrder as a parameter.
    private func setupPaytm() {
        
        serv = serv.createStagingEnvironment()
        let type :ServerType = .eServerTypeStaging
        let order = PGOrder(orderID: "", customerID: "", amount: "", eMail: "", mobile: "")
  
        order.params = ["MID":"rxazcv89315285234363",
                        "ORDER_ID":"order1",
                        "CUST_ID": "121",
                        "CHANNEL_ID":"WAP",
                        "INDUSTRY_TYPE_ID":"Retail",
                        "WEBSITE": "APP_STAGING",
                        "TXN_AMOUNT": "1024",
                        "CHECKSUMHASH":"oCDBVF+hvVb68JvzbKI40TOtcxlNjMdixi9FnRSh80Ub7XfjvgNr9NrfrOCPLmt65UhStCkrDnlYkclz1qE0uBMOrmuKLGlybuErulbLYSQ=",
                        "CALLBACK_URL" :"https://securegw-stage.paytm.in/theia/paytmCallback?ORDER_ID=order1"]
        
        self.txnController =  self.txnController.initTransaction(for: order) as?PGTransactionViewController
        self.txnController.title = "Paytm Payments"
        self.txnController.setLoggingEnabled(true)
        
        if(type != ServerType.eServerTypeNone) {
            self.txnController.serverType = type;
        } else {
            return
        }
        
        self.txnController.merchant = PGMerchantConfiguration.defaultConfiguration()
        self.txnController.delegate = self
        
        self.navigationController?.pushViewController(self.txnController
            , animated: true)
    }

5. Implement protocol  ‘PGTransactionDelegate’ 

Implement protocol  ‘PGTransactionDelegate’ to the viewcontroller from where have to do payment

//MARK : Delegate Methods

extension ScheduleOnOderVC : PGTransactionDelegate {
    
    //this function triggers when transaction gets finished
    func didFinishedResponse(_ controller: PGTransactionViewController, response responseString: String) {
        
        let msg : String = responseString
        var titlemsg : String = ""
        if let data = responseString.data(using: String.Encoding.utf8) {
            do {
                if let jsonresponse = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String:Any] , jsonresponse.count > 0{
                    titlemsg = jsonresponse["STATUS"] as? String ?? ""
                }
            } catch {
                print("Something went wrong")
            }
        }
        
        let actionSheetController: UIAlertController = UIAlertController(title: titlemsg , message: msg, preferredStyle: .alert)
        let cancelAction : UIAlertAction = UIAlertAction(title: "OK", style: .cancel) {
            action -> Void in
            controller.navigationController?.popViewController(animated: true)
        }
        actionSheetController.addAction(cancelAction)
        self.present(actionSheetController, animated: true, completion: nil)
    }
    //this function triggers when transaction gets cancelled
    func didCancelTrasaction(_ controller : PGTransactionViewController) {
        controller.navigationController?.popViewController(animated: true)
    }
    //Called when a required parameter is missing.
    func errorMisssingParameter(_ controller : PGTransactionViewController, error : NSError?) {
        controller.navigationController?.popViewController(animated: true)
    }
}

6. Verify checksum

Checksumhash needs to be verified so that response have not been tampered. Verification is done on the server side.

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