update struk

lib/model/sale_transaction_model.dart

@@ -260,6 +260,7 @@ class SalesProduct {
     this.productPurchasePrice,
     this.productCode,
     this.productType,
+    this.vat,
   });
 
   SalesProduct.fromJson(dynamic json) {
@@ -270,6 +271,7 @@ class SalesProduct {
     productType = json['product_type'];
     productPurchasePrice = json['productPurchasePrice'];
     category = json['category'] != null ? Category.fromJson(json['category']) : null;
+    vat = json['vat'] != null ? SalesVat.fromJson(json['vat']) : null;
   }
 
   num? id;
@@ -279,6 +281,7 @@ class SalesProduct {
   num? productPurchasePrice;
   String? productType;
   Category? category;
+  SalesVat? vat;
 
   Map<String, dynamic> toJson() {
     final map = <String, dynamic>{};
@@ -288,6 +291,9 @@ class SalesProduct {
     if (category != null) {
       map['category'] = category?.toJson();
     }
+    if (vat != null) {
+      map['vat'] = vat?.toJson();
+    }
     return map;
   }
 }
@@ -507,6 +513,14 @@ class SalesVat {
   num? id;
   String? name;
   num? rate;
+
+  Map<String, dynamic> toJson() {
+    final map = <String, dynamic>{};
+    map['id'] = id;
+    map['name'] = name;
+    map['rate'] = rate;
+    return map;
+  }
 }
 
 class Branch {