When using the API to create a new ORCID I might occasionally receive a 400 response with "User with this email already exist." in the . I'm worried that this text may not be stable, and would prefer each error condition to have a unique identifier (e.g. "email-already-used"). In this particular case, it would also be worthwhile to be told which email address is already in use so we can inform the user that they already have an ORCID registered with that email address.
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