transactions method
Implementation
Future<List<UsageTransaction>> transactions() async {
final url = Uri.parse('${baseUrl}api/usage/transactions');
final response = await client.get(url);
if (response.statusCode != 200) {
throw MailosaurError(response);
}
final data = jsonDecode(response.body);
return (data['items'] as List<dynamic>)
.map((item) => UsageTransaction.fromJson(item))
.toList();
}