The department may deny any license applied for under this chapter that does not fulfill the minimum requirements which the department may prescribe by rules and regulations and may suspend or revoke a license which has been issued if an applicant or a licensee violates any of such rules and regulations; provided, however, that before any order is entered denying a license applied for or suspending or revoking a license previously granted, the applicant or license holder, as the case may be, shall be afforded an opportunity for a hearing as provided for in Chapter 13 of Title 50, the "Georgia Administrative Procedure Act."