added initatePayment and checkTxnStatus

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

@@ -0,0 +1,55 @@
+package com.billpaymentservice.bbps.entites;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@Entity
+@Table(name = "bill_payment")
+public class BillPayment {
+
+    @Id
+    @Column(name = "txn_id")
+    private String txnId;
+
+    @Column(name = "ref_id")
+    private String refId;
+
+    @Column(name = "biller_id")
+    private String billerId;
+
+    @Column(name = "biller_category")
+    private String billerCategory;
+
+    @Column(name = "biller_name")
+    private String billerName;
+
+    @Column(name = "payment_mode")
+    private String paymentMode;
+
+    @Column(name = "txn_amount")
+    private double txnAmount;
+
+    @Column(name = "status")
+    private String status;
+
+    @Column(name = "currency")
+    private String currency;
+
+    @Column(name = "payment_channel")
+    private String paymentChannel;
+
+    @Column(name = "customer_mobile")
+    private String customerMobNo;
+
+    @Column(name = "created_at")
+    private LocalDateTime createdAt = LocalDateTime.now();
+
+    // 🔗 One bill payment has many remitter identities
+    @OneToMany(mappedBy = "billPayment", cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
+    private List<RemitterIdentity> remitterIdentities;
+}