I've spent a lot of time searching and trying to find a solution, so far without success.
However I am continually getting the error
I have tried different options originally with localhost, but even when I load up a page onto a simple domain I get the same message.
I have tried variations of the redirect url- none appear to work.
My web page:
I have registered and have a client ID, and have tried variations of the redirect URL in the API settings, such as mydomain.com, www.mydomain.com, and www.mydomain.com/redirect with no success.
While I have found many good solutions in Stack Overflow previously this is the first time I have asked a question. Thank you.