In order to maintain and expand domestic consumption of upland cotton produced in the United States and to prevent discrimination against the domestic users of such cotton, notwithstanding any other provision of law, the Commodity Credit Corporation, under such rules and regulations as the Secretary may prescribe, is authorized and directed for the period beginning with April 11, 1964 and ending July 31, 1966, to make payments through the issuance of payment-in-kind certificates to persons other than producers in such amounts and subject to such terms and conditions as the Secretary determines will eliminate inequities due to differences in the cost of raw cotton between domestic and foreign users of such cotton, including such payments as may be necessary to make raw cotton in inventory on April 11, 1964 available for consumption at prices consistent with the purposes of this section: Provided, That for the period beginning August 1 of the marketing year for the first crop for which price support is made available under section 1444(b) of this title, and ending July 31, 1966, such payments shall be made in an amount which will make upland cotton produced in the United States available for domestic use at a price which is not in excess of the price at which such cotton is made available for export. The Secretary may extend the period for performance of obligations incurred in connection with payments made for the period ending July 31, 1966, or may make payments on raw cotton in inventory on July 31, 1966, at the rate in effect on such date. No payments shall be made hereunder with respect to 1966 crop cotton.