added database for bill intitate and bill payment and removed the polling logic

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

@@ -0,0 +1,52 @@
+package com.billpaymentservice.bbps.entites;
+import java.time.LocalDateTime;
+import java.util.List;
+
+import com.billpaymentservice.bbps.dto.BillerResponseBill;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.OneToOne;
+import jakarta.persistence.Table;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Entity
+@Table(name = "bill_master")
+@Builder
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class BillMaster {
+
+    @Id
+    private String billId; // primary key
+
+    private String reqId; // client se aaya hua
+    private String txnId; // system-generated
+    private String refId;
+    private String billerId;
+    private String status;
+    private String actionType;
+    private String userId;
+    @OneToOne(cascade = CascadeType.ALL)
+    @JoinColumn(name = "biller_response_id")
+    private BillerResponse billerResponse;
+    @OneToMany(mappedBy = "billMaster", cascade = CascadeType.ALL)
+    private List<AdditionalInfoBill> additionalInfo;
+    @OneToMany(mappedBy = "billMaster", cascade = CascadeType.ALL)
+    private List<CustomerParamBill> customerParams;
+    private String creationDate;
+    private String modifiedDate;
+    private Long createdEpochDate;
+    private Long modifiedEpochDate;
+
+    // getters and setters
+}