added seprate auditable in entity

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

@@ -22,7 +22,7 @@ import lombok.ToString;
 @Entity
 @ToString
 @Table(name = "interchange_fee")
-public class InterchangeFee {
+public class InterchangeFee extends Auditable {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
@@ -48,4 +48,4 @@ public class InterchangeFee {
     @ManyToOne
     @JoinColumn(name = "biller_id", nullable = false)
     private BillerDetails biller;
-}
+}