Sending Notification to Specific User with Onesignal

i´m still having issues in this matter. I have exactly the same settings but it dont work.
I get the error “there was a problem in the JSON you submitted”
Can someone please help here???
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I am also not sure if it is the right YOUR_AUTHORISATION_CODE.
The turtorial says:
In the Property Field add “Authorization” and in the value field “Basic” & YOUR_AUTHORISATION_CODE which you can find here
But in that link i dont find any code. Is it the rest api key that it is reffering to or what precise is that code???The link shows me this

And there is no AUTHORISATION_CODE.
Am I complety misunderstang everything???

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