save before flutter upgrade

lib/models/customers/credit_card.dart

@@ -0,0 +1,33 @@
+import 'dart:convert';
+
+class CreditCard {
+  CreditCard({
+    required this.creditCardId,
+    required this.type,
+    required this.token,
+    required this.automatic,
+    required this.customerFk,
+  });
+
+  int creditCardId;
+  String type;
+  String token;
+  bool automatic;
+  int customerFk;
+
+  String get last4Digits => token.substring(token.length - 4);
+
+  factory CreditCard.fromJson(String str) => CreditCard.fromMap(json.decode(str));
+
+  factory CreditCard.fromMap(Map<String, dynamic> json) {
+    CreditCard creditCard = CreditCard(
+      creditCardId: json["credit_card_id"],
+      type: json['type'] ?? 'Credit Card',
+      token: json['token'],
+      automatic: json['automatic'] ?? true,
+      customerFk: json['customer_fk'],
+    );
+
+    return creditCard;
+  }
+}