Can't send notification to External User ID

[ibnuhalimm]

Laravel Version

6.20.44

PHP Version

7.3.27

Laravel-Onesignal Version

1.0.7

Description

I was implemented OneSignal::sendNotificationToExternalUser method to send notification for my users. But, then I'm getting an error like this

Client error: `POST https://onesignal.com/api/v1/notifications` resulted in a `400 Bad Request` response:
{"errors":["include_external_user_ids must be an array of non empty strings"]}
 {"exception":"[object] (GuzzleHttp\\Exception\\ClientException(code: 400): Client error: `POST https://onesignal.com/api/v1/notifications` resulted in a `400 Bad Request` response:
{\"errors\":[\"include_external_user_ids must be an array of non empty strings\"]}
 at /var/www/html/application/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:113)

I was looking for the root cause, then I realized that the problem is because of my $userId variable is an integer data type.
Then I cast my $userId variable as a string

OneSignal::sendNotificationToExternalUser("Notification message here", (string)$user->id);

[emmadedayo]

the error says "nclude_external_user_ids must be an array of non empty strings", can you paste the full code

[Kashif-Kframe]

You can set channel_for_external_user_ids as a param like this

OneSignal::sendNotificationToExternalUser(
    'message',
    '43'.  // external id
    'url',
    'data'
)

->setParameter('channel_for_external_user_ids', 'push')

then this function will work.