update payment

lib/features/orders/domain/entities/payment.dart

@@ -0,0 +1,84 @@
+/// Domain Entity: Payment
+///
+/// Represents a payment transaction from the API.
+library;
+
+import 'package:equatable/equatable.dart';
+
+/// Payment Entity
+///
+/// Contains payment information from API:
+/// - name: Payment ID (e.g., "ACC-PAY-2025-00020")
+/// - posting_date: Payment date
+/// - paid_amount: Amount paid
+/// - mode_of_payment: Payment method (e.g., "Chuyển khoản")
+/// - invoice_id: Related invoice ID (nullable)
+/// - order_id: Related order ID (nullable)
+class Payment extends Equatable {
+  /// Payment ID (e.g., "ACC-PAY-2025-00020")
+  final String name;
+
+  /// Payment posting date
+  final DateTime postingDate;
+
+  /// Amount paid
+  final double paidAmount;
+
+  /// Payment method (e.g., "Chuyển khoản", null if not specified)
+  final String? modeOfPayment;
+
+  /// Related invoice ID (nullable)
+  final String? invoiceId;
+
+  /// Related order ID (nullable)
+  final String? orderId;
+
+  const Payment({
+    required this.name,
+    required this.postingDate,
+    required this.paidAmount,
+    this.modeOfPayment,
+    this.invoiceId,
+    this.orderId,
+  });
+
+  /// Get display payment method
+  String get displayPaymentMethod => modeOfPayment ?? 'Chuyển khoản';
+
+  /// Get description based on order/invoice
+  String get description {
+    if (orderId != null) {
+      return 'Thanh toán cho Đơn hàng #$orderId';
+    } else if (invoiceId != null) {
+      return 'Thanh toán hóa đơn #$invoiceId';
+    }
+    return 'Thanh toán #$name';
+  }
+
+  /// Copy with method for immutability
+  Payment copyWith({
+    String? name,
+    DateTime? postingDate,
+    double? paidAmount,
+    String? modeOfPayment,
+    String? invoiceId,
+    String? orderId,
+  }) {
+    return Payment(
+      name: name ?? this.name,
+      postingDate: postingDate ?? this.postingDate,
+      paidAmount: paidAmount ?? this.paidAmount,
+      modeOfPayment: modeOfPayment ?? this.modeOfPayment,
+      invoiceId: invoiceId ?? this.invoiceId,
+      orderId: orderId ?? this.orderId,
+    );
+  }
+
+  @override
+  List<Object?> get props => [name, postingDate, paidAmount, modeOfPayment, invoiceId, orderId];
+
+  @override
+  String toString() {
+    return 'Payment(name: $name, paidAmount: $paidAmount, orderId: $orderId)';
+  }
+}