customMessage method
Implementation
Future<MessageSendResult> customMessage(
List<String> receiverUuids, int templateId,
{Map<String, String>? templateArgs}) async {
final params = {
"receiver_uuids": jsonEncode(receiverUuids),
"template_id": templateId,
"template_args": templateArgs == null ? null : jsonEncode(templateArgs)
};
return _message("", params);
}