is it possible to make a customer attribute unique, preferably on a website basis bit if not then globally?
I cant see how to do this.
Similar to the email address
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The customer attributes has no
is_unique option which is available for product attributes. The uniqueness of email is verified programatically in
\Mage_Customer_Model_Resource_Customer::_beforeSave. So you can just mimic it for your attribute.
Try to do this from magento backend.