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I'm implementing a simple application to generate some playlist for a user based on some provided data. However, I can't seem to get authorized, even though I've followed to procedures as far as I can tell.
This is the request URL I'm generating:
I have registered the redirect uri exactly like that in my application (replacing the %2F with a slash). I'm getting an amazingly vague "Oops, something went wrong" error message with a 500 status code after putting in my authentication details. Can anyone tell me what I'm doing wrong?