added a testing class for billers

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

@@ -0,0 +1,33 @@
+package com.billpaymentservice.bbps.entites;
+
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Table(name = "customer_params_bill_validate")
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class CustomerParamBillValidation {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id")
+    private Long id;
+
+    @Column(name = "name")
+    private String name;
+
+    @Column(name = "value")
+    private String value;
+
+    @Column(name = "type")
+    private String type;
+    
+    // ✅ Many Params → One Bill
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "bill_id_fk")
+    private BillValidation bill;
+}