User authentication from Excel macro

Where I work we have an authentication system where the use types their ID and password before logging into a site.  It's based on the OAuth 2.0 protocol.
I have an Excel macro which needs to use this authentication.  When the user starts the macro it needs to go to this system where they type their ID and password.  If both are correct the macro continues running.
To do this I need to supply an application name.  Once I do this the administrators will give me a unique token.  "Microsoft Excel" won't be acceptable application name as it won't uniquely indentify the macro.
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If all you need is a unique application identifier, what about appending the current time/date, either raw or converted into a numeric code, such as 081520120429. "Microsoft Excel 081520120429" should be a unique enough identifier if you don't have hundreds of users constantly using this interface.
AlHal2Author Commented:
I don't think the system administrators would accept such an application name.  What they have in mind is a website.
AlHal2Author Commented:
I should have clarified my question.  How do I get a vba macro to go to a website where the user can enter their ID and password.
Once the system has confirmed the ID and password are correct the macro should carry on running.
Martin LissOlder than dirtCommented:
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