configuration for an external id users

[YasiYaseen]

How can we help?

i wanted to send to a specific user with an external id .
so how to change this.

$config = Configuration::getDefaultConfiguration()
->setAppKeyToken(APP_KEY_TOKEN)
->setUserKeyToken(USER_KEY_TOKEN);

$apiInstance = new DefaultApi(
new GuzzleHttp\Client(),
$config
);

now when i add $notification->setIncludeExternalUserIds(['EXTERNAL_ID']);
It gives an error {"errors":["Please include a case-sensitive header of Authorization: Basic \u003cYOUR-REST-API-KEY-HERE\u003e or Bearer

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[LowKey1998]

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