Each applicant for a permit under this chapter shall be charged a permit fee as provided for in § 9.00 of the Fee Schedule (Appendix 1 of this Code). Such fees shall be paid by the person desiring such permit and are payable at the time of application. This fee shall not be prorated nor refunded regardless of whether a permit is issued. No fee shall be charged to persons offering for sale agricultural products, meats, poultry, or other articles of food grown or produced by such persons. A permit shall be issued to such persons by the City Secretary upon satisfactory proof that they have produced or grown the product(s) to be peddled and such license shall so state. No fee shall be charged to any bona fide charitable, religious, educational, or philanthropic organization, or persons engaged in interstate commerce. The term "interstate commerce" means soliciting, selling, or taking orders, or offering to take orders, for any goods or services which, at the time the order is taken, are in or will be produced in any federal district or territory, any commonwealth, or any state other than the State of Texas, and shipped or introduced into this city in the fulfillment of such orders.