// The SDK is initialized as shared instance so can be accessed
// from multiple View Controllers
AcceptSDK *sdk = [AcceptSDK sharedInstance];

// Set the SDK target environment - in this case Public Test
// and the username and password to authenticate to it
[sdk setupWithEnvironment:AcceptEnvironmentPublicTest
                 username:@"yourUsername"
                 password:@"yourPassword"];

// Create the instance of the Sale Request
// Here the minimum data is depicted
WDAcceptSaleRequest *saleRequest = [[WDAcceptSaleRequest alloc] initWithUniqueId:@"yourSaleUniqueID" // provide your unique ID to identify the Sale
                                                                        location:nil // provide the GPS location
                                                                  inclusiveTaxes:YES // Tax inclusive/exclusive flag
                                                                        currency:@"EUR" // Currency to use for this Sale
                                                                            note:@"Test Posmate Sale" // Top level note for this sale
                                                                 gratuityTaxRate:nil // Gratuity tax rate - nil if no gratuity to be set later in the payment flow
                                    ];

// Create one item named "Item 1" costing 10.00 EUR at 20% Tax
[saleRequest addSaleItem:[NSDecimalNumber decimalNumberWithString:@"10.00"] // Item Unit price
                quantity:1 // Item Quantity
                 taxRate:[NSDecimalNumber decimalNumberWithString:@"20.00"] // Item Tax rate
         itemDescription:@"Item 1" // Item description
               productId:nil // External product ID - in the case you are using ERP - such as SAP and wish to refer to the product
 ];

// Define the Sale operation as Purchase
saleRequest.operation = AcceptSaleOperationPurchase;


// Discover active terminals and use it - in this case we use the first one
// Alternatively use the one discovered previously and stored in an instance variable (or user preferences)
[sdk.terminalManager discoverDevices:WDAMiuraExtensionUUID
                          completion:^(NSArray<WDAcceptTerminal *> * _Nullable terminals, NSError * _Nullable devicesError)
 {

     // Set this Sale in total amount 10 EUR to be settled half by Card transaction (5 EUR)
     [saleRequest addCardTransaction:[NSDecimalNumber decimalNumberWithString:@"5.00"]
                            terminal:[terminals firstObject]];

     // and half by Cash transaction (5 EUR)
     [saleRequest addCashTransaction:[NSDecimalNumber decimalNumberWithString:@"5.00"]];


     // Create Payment Configuration to be used in the Pay API later
     WDAcceptPaymentConfig *paymentConfiguration = [WDAcceptPaymentConfig new];

     // Set the Sale of this payment configuration to be your new Sale Request
     paymentConfiguration.sale = saleRequest;


     // The end of the payment process
     SaleCompletion paymentCompletion = ^(WDAcceptSaleResponse* sale, NSError* error){
         //sale - Is the completed Sale - contains the sale status, details, results
         //error - If any error is encountered during the sale it would be reported
         //in the form of error and hierarchy of underlying errors to give you as much details as possible
     };

     // Updates from the payment flow
     PaymentProgress progressUpdate = ^(AcceptStateUpdate statusUpdate){
         // statusUpdate - coded statuses are reported throughout the payment flow
     };

     // In the case the Cardholder Signature is required by the Payment flow this block will be executed
     // Your task is to respond to it by collecting the signature image from the customer and
     // posting it back in the sendCollectedSignature method
     SignatureRequiredRequest signatureRequiredRequest = ^(WDAcceptSignatureRequest* signatureRequest){
         //signatureRequest - comes from the payment flow and once you collect the signature from the customer
         // send it back in the signatureRequest.sendCollectedSignature
         signatureRequest.sendCollectedSignature([TestUtils signatureImageFromText:@"Test"],nil);
         //The signature image is transferred to the backend and stored with the Sale
     };

     // Note: Applicable to terminals without BUTTONS
     // In the case the Cardholder Signature was collected then the merchant is required to confirm it's validity
     // A. If the terminal has buttons that are used for Approving/Rejecting then this block is either never called from Payment flow
     // or it's signatureVerificationCallback comes nil
     // B. If the terminal does not have buttons then the Application must present a user interface to Approve/Reject the Cardholder Signature
     SignatureVerificationRequest verifySignature = ^(SignatureVerificationResult signatureVerificationResult, NSError* signatureVerificationError){

         if (signatureVerificationResult) {
             // Here the simplified use of Approving the Cardholder Signature is demonstrated
             signatureVerificationResult(AcceptSignatureVerificationResultApproved);
         }

     };

     // Note: Applicable to terminals without BUTTONS
     // In the case the payment Card has more than one card application available then the client application
     // has to present user interface for the Cardholder to select preferred card application
     // The list of card applications is present in appSelectionRequest.appsArray as a list of Strings
     PaymentCardApplicationSelectionRequest cardAppSelection = ^(WDAcceptAppSelectionRequest * appSelectionRequest){
         // There is more than 1 card application available
         // Present the UI for the Cardholder to select preferred card application (Debit | Credit)
         if(appSelectionRequest.appsArray.count > 0){
             // Here we demonstrate the simplified use of selecting the first card application from the list of available card applications
             // and sending it to the Payment flow
             appSelectionRequest.sendSelectedCardApplication(0);
         }
     };

     // Start the Payment flow
     [[sdk saleManager] pay:paymentConfiguration // the payment configuration containing the Sale Request
                   progress:progressUpdate // Block to be executed at the time of Payment flow progress update
           collectSignature:signatureRequiredRequest // Block to be executed at the time of Requesting the capture of the Cardholder signature
            verifySignature:verifySignature // Block to be executed if terminal asks Application to confirm the validity of the Cardholder signature
      selectCardApplication:cardAppSelection // Block to be executed if terminal asks for the Card Application selection in the case Card supports more than one card application
                 completion:paymentCompletion]; // Block to be executed at the end of the Payment process



 }];