Custom field validation call to external API

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Need to know if there is a way to validate custom fields (added to the app metadata) on user signup. I need to be able to call out to an external api (hosted separately) to validate if the user input for the custom fields is valid. Can I do this using LockUI and a rule? If not, How can I do this?

Thank you.

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At first glance, this sounds like a great use case for a pre-registration hook.

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