toJson method
Implementation
Map<String, dynamic> toJson() => <String, dynamic>{
'id': id,
'account': null,
'type': type,
'created_at': createdAt,
'paging_token': pagingToken,
'_links': links,
'limit': limit,
'asset_type': assetType,
'asset_code': assetCode,
'asset_issuer': assetIssuer
};