Cw 1611 fetch moon pay payment methods from their api

lib/buy/moonpay/moonpay_payment_methods.dart

@@ -0,0 +1,32 @@
+class MoonPayPaymentMethod {
+  MoonPayPaymentMethod({
+    required this.type,
+    required this.displayName,
+    required this.iconUrl,
+    required this.active,
+    this.limitAmount,
+    this.limitCurrencyCode,
+  });
+
+  factory MoonPayPaymentMethod.fromJson(Map<String, dynamic> json) {
+    final availability = json["availability"] as Map<String, dynamic>? ?? {};
+    final limits = json["limits"] as Map<String, dynamic>?;
+    final perTransaction = limits?["perTransaction"] as Map<String, dynamic>?;
+
+    return MoonPayPaymentMethod(
+      type: json["type"] as String? ?? "",
+      displayName: json["displayName"] as String? ?? "",
+      iconUrl: json["iconUrl"] as String? ?? "",
+      active: availability["active"] as bool? ?? false,
+      limitAmount: (perTransaction?["limit"] as num?)?.toDouble(),
+      limitCurrencyCode: perTransaction?["currencyCode"] as String?,
+    );
+  }
+
+  final String type;
+  final String displayName;
+  final String iconUrl;
+  final bool active;
+  final double? limitAmount;
+  final String? limitCurrencyCode;
+}