Yes, user will fill the additional fields in "About me" tab and click save (ajax save).....my plugin gets triggered at user_presavedata hook. which means (correct me if I am wrong) that when user enters the value and clicks save, my plugin executes first before saving the value in the database.
My plugin then validates that the entered information is consistent (i.e the API call) and then I change user's usergroup and the value is saved in the profile field.....
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