sendSMS method
Implementation
@override
Future<String> sendSMS({
required String message,
required String phone,
int? subId,
int? externalId,
int? localId,
}) {
final mapData = <dynamic, dynamic>{};
mapData['message'] = message;
mapData['phone'] = phone;
mapData['subId'] = subId;
mapData['externalId'] = externalId;
mapData['localId'] = localId;
return methodChannel
.invokeMethod<String>('sendSMS', mapData)
.then((value) => value ?? 'Error sending sms');
}