working implementation for poc

src/main/java/zw/qantra/tm/domain/models/Transaction.java

@@ -58,6 +58,13 @@ public class Transaction extends BaseEntity {
     private String paymentProcessorName;
     private String providerImage;
     private String paymentProcessorImage;
+
+    private String erpSalesRef;
+    private String erpJournalRef;
+    private String erpSalesPaymentRef;
+    private String erpPurchaseRef;
+    private String erpPurchasePaymentRef;
+
     @Enumerated(EnumType.STRING)
     private RequestType type;
     @Enumerated(EnumType.STRING)

src/main/java/zw/qantra/tm/domain/services/TransactionService.java

@@ -61,6 +61,7 @@ public class TransactionService {
         String label = transaction.getType() + "_" +
                 provider.getIntegrationProcessorLabel();
         logger.info("label: {}", label);
+        transaction.setIntegrationProcessorLabel(provider.getIntegrationProcessorLabel()); // for reference purposes
         
         TransactionProcessorInterface transactionProcessorInterface =
                 (TransactionProcessorInterface) paymentProcessorFactory.getPaymentProcessor(label);

src/main/java/zw/qantra/tm/domain/services/processors/handlers/CalculateChargesHandler.java

@@ -50,7 +50,9 @@ public class CalculateChargesHandler implements LogicHandler<Transaction, Transa
                 }
                 if(isPresent) break; // we've found a matching condition, no need to check rest of conditions
             }
-            if(!isPresent) continue; // if we did not find a match, means this charge does not apply to this transaction
+            // if we did not find a match, means this charge does not apply to this transaction
+            // also implies there is no need to check exemptions
+            if(!isPresent) continue; 
 
             boolean isExempt = false;
             for (ChargeCondition chargeCondition: charge.getExcludes()){

src/main/java/zw/qantra/tm/domain/services/processors/handlers/erp/SalesInvoiceHandler.java

@@ -14,7 +14,6 @@ import zw.qantra.tm.domain.services.processors.handlers.LogicHandler;
 public class SalesInvoiceHandler implements LogicHandler<Transaction, Transaction>{
     Logger logger = LoggerFactory.getLogger(SalesInvoiceHandler.class);
     
-
     @Override
     public Transaction process(Transaction transaction) {
         logger.info("Processing sales invoice for transaction: {}", transaction.getReference());

src/main/java/zw/qantra/tm/domain/services/processors/payments/EcocashRemotePaymentProcessor.java

@@ -42,7 +42,10 @@ public class EcocashRemotePaymentProcessor implements TransactionProcessorInterf
         String token = restService.getMerchantToken();
 
         // send total less gateway charges
-        BigDecimal totalAmount = transaction.getAmount().add(transaction.getTax()).add(transaction.getCharge());
+        BigDecimal totalAmount = transaction.getAmount()
+            .add(transaction.getTax())
+            .add(transaction.getCharge())
+            .add(transaction.getGatewayCharge());
 
         String concat = clientId+
             encryptionKey+

src/main/java/zw/qantra/tm/domain/services/processors/payments/MPGSWebPaymentProcessor.java

@@ -43,7 +43,10 @@ public class MPGSWebPaymentProcessor implements TransactionProcessorInterface {
         String token = restService.getMerchantToken();
 
         // send total less gateway charges
-        BigDecimal totalAmount = transaction.getAmount().add(transaction.getTax()).add(transaction.getCharge());
+        BigDecimal totalAmount = transaction.getAmount()
+            .add(transaction.getTax())
+            .add(transaction.getCharge())
+            .add(transaction.getGatewayCharge());
 
         String concat = clientId+
             encryptionKey+

src/main/java/zw/qantra/tm/domain/services/processors/payments/StewardWebPaymentProcessor.java

@@ -1,5 +1,6 @@
 package zw.qantra.tm.domain.services.processors.payments;
 
+import java.math.BigDecimal;
 import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
@@ -41,10 +42,15 @@ public class StewardWebPaymentProcessor implements TransactionProcessorInterface
         logger.info("processing transaction");
         String token = restService.getMerchantToken();
 
+        BigDecimal totalAmount = transaction.getAmount()
+            .add(transaction.getTax())
+            .add(transaction.getCharge())
+            .add(transaction.getGatewayCharge());
+
         String concat = clientId+
             encryptionKey+
             transaction.getCreditPhone()+
-            transaction.getAmount();
+            totalAmount;
 
         String hex = getHash(concat);
 
@@ -52,7 +58,7 @@ public class StewardWebPaymentProcessor implements TransactionProcessorInterface
                 .clientId(clientId)
                 .clientSecret(clientSecret)
                 .phone(transaction.getCreditPhone())
-                .amount(transaction.getAmount().toString())
+                .amount(totalAmount.toString())
                 .currency(transaction.getDebitCurrency().toString())
                 .hash(hex)
                 .authType("WEB")