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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[LowKey1998]

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[LowKey1998]

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