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See my post earlier about adding &debug=on to the edit screen for the Payments Pro module settings just to turn it on.

Error code #1 is indeed user authentication error ... meaning the user/vendor/partner/password info isn't being accepted.

It might be wise to "create" a user account if you haven't already created...

Hmmm ... I'll have to look into why that's not available as an option by default.

Click on Edit for your Express Checkout settings.
Then in the browser URL, add &debug=on and press Enter
Now...

The code is ready, and functional.

You'll need to specify both the user/vendor/partner/password section, as well as the API user/signature/password settings.

Then you'll need to set both...