improved code quality and tested with test data

src/main/java/com/billpaymentservice/bbps/dto/BillerDTO.java

@@ -2,6 +2,7 @@ package com.billpaymentservice.bbps.dto;
 
 import java.util.List;
 
+import com.billpaymentservice.bbps.entites.AdditionalInfoBillValidate;
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 
 import jakarta.validation.constraints.NotBlank;
@@ -102,7 +103,7 @@ public class BillerDTO {
     private BillerResponseParamsDTO billerResponseParams;
 
     private List<AdditionalInfoDTO> billerAdditionalInfos;
-    private List<AdditionalInfoDTO> billerAdditionalInfoPayments;
+    private List<BillerAdditonalInfoDTO> billerAdditionalInfoPayments;
 
     private List<InterchangeFeeConfDTO> interchangeFeeConves;
     private List<InterchangeFeeDTO> interchangeFees;

src/main/java/com/billpaymentservice/bbps/dto/response/FetchBillValidateResponse.java

@@ -19,7 +19,6 @@ import lombok.ToString;
 @NoArgsConstructor
 @ToString
 public class FetchBillValidateResponse {
-
 	@JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
 	private GeneralResp genericResponse;
 	private String billId;

src/main/java/com/billpaymentservice/bbps/entites/BillValidation.java

@@ -37,8 +37,8 @@ public class BillValidation {
     @Column(name = "biller_response", columnDefinition = "TEXT")
     private String billerResponse;
 
-    @Column(name = "additional_info", columnDefinition = "TEXT")
+    @OneToMany(mappedBy = "bill", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
-    private  String additionalInfo;
+    private List<AdditionalInfoBillValidate> additionalInfo;
 
     // 👇 Proper nested customer params (OneToMany)
     @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "bill")

src/main/java/com/billpaymentservice/bbps/entites/BillerAdditionalInfoPayment.java

@@ -13,7 +13,7 @@ import lombok.Getter;
 import lombok.Setter;
 @Getter
 @Setter
-@Table(name = "biller_additional_additional_info_payment")
+@Table(name = "biller_additional_info_payment")
 @Entity
 public class BillerAdditionalInfoPayment {
 	     @Id

src/main/java/com/billpaymentservice/bbps/entites/BillerDetails.java

@@ -29,7 +29,8 @@ import lombok.ToString;
 	    "billerAdditionalInfos",
 	    "interchangeFeeConves",
 	    "interchangeFees",
-	    "billerPlanResponseParams"
+	    "billerPlanResponseParams",
+	    "billerAdditionalInfoPayments"
 	})
 
 @Table(name = "biller_details")
@@ -151,11 +152,9 @@ public class BillerDetails {
     @OneToMany(mappedBy = "biller", cascade = CascadeType.ALL, orphanRemoval = true)
     private List<AdditionalInfo> billerAdditionalInfos;
 
-	
+    @OneToMany(mappedBy = "biller", cascade = CascadeType.ALL, orphanRemoval=true) 
-	/*
+    private List<BillerAdditionalInfoPayment> billerAdditionalInfoPayments;
-		 * OneToMany(mappedBy = "biller", cascade = CascadeType.ALL, orphanRemoval
+		 
-		 * =true) private List<AdditionalInfo> billerAdditionalInfoPayments;
-		 */
 	 
     @OneToMany(mappedBy = "biller", cascade = CascadeType.ALL, orphanRemoval = true)
     private List<InterchangeFeeConf> interchangeFeeConves;

src/main/java/com/billpaymentservice/bbps/serviceImpl/MasterDataServiceImpl.java

@@ -194,7 +194,7 @@ public class MasterDataServiceImpl implements MasterDataService {
 			mapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT);
 			BillerDetails entity = mapper.map(responseWrapper.getBillerDAO(), BillerDetails.class);
 			EntityRelationshipUtil.linkBillerRelationships(entity);// linking nesting entity foreign key
-			//helper.saveOrUpdateBillerData(entity);
+			helper.saveOrUpdateBillerData(entity);
 			ResponseModel responseModel = new ResponseModel(generalResp.getMessage(), generalResp.getStatus(),
 					Integer.parseInt(generalResp.getStatusCode()), responseWrapper);
 			helper.updateInboundLogSuccess(inboundLog, responseData, generalResp.getStatus());

src/main/java/com/billpaymentservice/bbps/util/EntityRelationshipUtil.java

@@ -37,6 +37,10 @@ public class EntityRelationshipUtil {
             entity.getBillerAdditionalInfos().forEach(a -> a.setBiller(entity));
         }
         
+        if(entity.getBillerAdditionalInfoPayments() != null) {
+			entity.getBillerAdditionalInfoPayments().forEach(a -> a.setBiller(entity));
+		}
+       
 
         if (entity.getInterchangeFees() != null) {
             for (InterchangeFee fee : entity.getInterchangeFees()) {

src/main/java/com/billpaymentservice/bbps/util/Helper.java

@@ -26,6 +26,7 @@ import com.billpaymentservice.bbps.dto.sentRequest.BillPaymentForwardRequest;
 import com.billpaymentservice.bbps.dto.sentRequest.FetchBillForwardRequest;
 import com.billpaymentservice.bbps.dto.sentRequest.FetchBillValidatestForwardRequest;
 import com.billpaymentservice.bbps.entites.AdditionalInfoBill;
+import com.billpaymentservice.bbps.entites.AdditionalInfoBillValidate;
 import com.billpaymentservice.bbps.entites.BBPSMastersData;
 import com.billpaymentservice.bbps.entites.BillMaster;
 import com.billpaymentservice.bbps.entites.BillValidation;
@@ -218,32 +219,7 @@ public class Helper {
 	    Optional<BillerDetails> existingOpt = billerDataRespository.findByBillerId(newEntity.getBillerId());
 
 	    if (existingOpt.isPresent()) {
-	        BillerDetails existing = existingOpt.get();
+	       //logic to be written 
-
-	        // Update base biller fields
-	        existing.setBillerName(newEntity.getBillerName());
-	        existing.setBillerAliasName(newEntity.getBillerAliasName());
-	        existing.setBillerDescription(newEntity.getBillerDescription());
-	        existing.setStatus(newEntity.getStatus());
-	        existing.setBillerCoverage(newEntity.getBillerCoverage());
-	        // ... (update other simple fields as needed)
-
-	        // ✅ Clear and replace nested lists to avoid duplicate inserts
-	        existing.getBillerPaymentModes().clear();
-	        if (newEntity.getBillerPaymentModes() != null) {
-	            for (PaymentMode mode : newEntity.getBillerPaymentModes()) {
-	                mode.setBiller(existing);
-	                existing.getBillerPaymentModes().add(mode);
-	            }
-	        }
-	        existing.getBillerPaymentChannels().clear();
-	        if (newEntity.getBillerPaymentChannels() != null) {
-	            for (PaymentChannel channel : newEntity.getBillerPaymentChannels()) {
-	                channel.setBiller(existing);
-	                existing.getBillerPaymentChannels().add(channel);
-	            }
-	        }
-	        billerDataRespository.save(existing);
 	    } 
 	    else {
 	        // brand new biller
@@ -348,7 +324,18 @@ billMasterRepository.save(billMaster);
 	                        .collect(Collectors.toList());
 	                billEntity.setCustomerParams(customerParams);
 	            }
-
+	            if (responseWrapper.getAdditionalInfo() != null) {
+	              List<AdditionalInfoBillValidate> additionalInfos = responseWrapper.getAdditionalInfo()
+	                        .stream()
+	                        .map(info -> {
+	                            AdditionalInfoBillValidate ai = modelMapper.map(info, AdditionalInfoBillValidate.class);
+	                            ai.setBill(billEntity); // maintain relation
+	                            return ai;
+	                        })
+	                        .collect(Collectors.toList());
+	                billEntity.setAdditionalInfo(additionalInfos);
+	                
+	            }
 	            // ✅ Save everything (cascade handles child)
 	            
 	            billValidationRepository.save(billEntity);