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Check if custom field value is not used already / unique?


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I am selling hosted email accounts. I have created a custom field "User name" for the product which is used for their personal email address (username@company.com).


Is there a way for me to check if the user name already exist in our database when the customer clicks on the continue button on the order form? or is there a proper way of doing this?


TIA for your reply.



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