cretaed entities for BillerDetail

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

@@ -0,0 +1,26 @@
+package com.billpaymentservice.bbps.dto;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class InterchangeFeeDTO {
+    @NotBlank(message = "Interchange Fee ID cannot be blank")
+    private String interchangeFeeId;
+
+    @NotBlank(message = "Fee code is mandatory")
+    private String feeCode;
+
+    private String feeDesc;
+    private String feeDirection;
+
+    // ✅ One-to-Many relation represented by DTO list
+    private List<InterchangeFeeDetailDTO> interchangeFeeDetails;
+
+}