fetchUpgradeOfferConfig method
Implementation
@override
Future<Map<String, dynamic>> fetchUpgradeOfferConfig({String? productId, required String userId}) async {
final result = await methodChannel.invokeMethod<Map>('fetchUpgradeOfferConfig', {
if (productId != null) 'productId': productId,
'userId': userId,
});
return Map<String, dynamic>.from(result!);
}