phpSmug OAuth error 401

SmugCoderSmugCoder Registered Users Posts: 1 Beginner grinner
I am trying to use phpSmug OAuth example from here. https://github.com/lildude/phpSmug/tree/main/examples

First step works and it redirects me th SmugMug to enter user/pw
after returning to the redirect URL the getAccessToken fails with 401 / invalid_signature

Hopefully someone can help
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