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We are looking to implement rel=publisher to verify our website against our Google+ page.
However, according to the Rich Snippets tool, this only appears to work with a numeric page ID: e.g. https://plus.google.com/103037366582313115962/
However, we have a vanity URL https://plus.google.com/+TheGuardian
How can I find out our numeric page ID based on a Vanity URL?