How can we send notification message to all app users instead of providing device ids

[kamleshwebtech]

Kindly suggest, how can we send notification message to all app users instead of providing devices token?

If i do not provide device-token then system returns an error:

Fatal error: Uncaught UnexpectedValueException: message must have at least one recipient in D:\xampp\htdocs\sites\test\vendor\paragraph1\php-fcm\src\Message.php:130 Stack trace: #0 [internal function]: paragraph1\phpFCM\Message->jsonSerialize() #1 D:\xampp\htdocs\sites\test\vendor\paragraph1\php-fcm\src\Client.php(72): json_encode(Object(paragraph1\phpFCM\Message)) #2 D:\xampp\htdocs\sites\test\index.php(24): paragraph1\phpFCM\Client->send(Object(paragraph1\phpFCM\Message)) #3 {main} thrown in D:\xampp\htdocs\sites\test\vendor\paragraph1\php-fcm\src\Message.php on line 130