Each county or city and county board of education or community colleges board may issue temporary certificates for the purpose of authorizing salary payments to child development employees whose child development permit applications are being processed. The applicant for such a temporary certificate shall make a statement under oath that he has duly filed his application for a permit together with the required fee and that to the best of his knowledge no reason exists why he should not be issued a permit. Such certificate shall be valid for not more than 90 schooldays and only until the permit originally requested is either issued or denied by the Commission for Teacher Preparation and Licensing.