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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def fetch_user(app_id, token, ticket, url_detail='https://pswdless.appspot.com/rest/detail'):
    '''
    Fetch the user deatil from Passwordless
    '''
    return FetchUserWithValidation(app_id, token, ticket, url_detail)