The phrase "authorized supplier" is correct and usable in written English.
It can be used to refer to a supplier that has been officially approved or recognized by a company or organization to provide goods or services.
Example: "We only work with authorized suppliers to ensure the quality and reliability of our products."
Alternatives: "approved vendor" or "certified supplier".
Denying their role as an "authorized" supplier (though not denying that they did purchase from one of the company's in the collapsed building after the release of a New York Times expose), Wal-Mart refused to sign on.
Walmart says it had no "authorized" supplier at Rana but one of the factories listed Walmart as a client, reports the Associated Press, and other companies have scrambled to distance themselves from the facility.
We also make custom flags, and we're the authorized supplier to the United Nations.
"When airline ticket prices decline, it increases the mortality rate of travel agents," said William Jackman of the Airlines Reporting Corporation, the industry's authorized supplier of ticket forms.
It's also the only authorized supplier of the Lightning connector acceptable for the MFI program.
According to Sergei Kiriyenko, the head of Russia's state atomic energy agency, RosAtom, all of it goes to U.S. companies through a single authorized supplier.
(d) Peripheral devices, as defined in § 15.3(r), shall be authorized under Supplier's Declaration of Conformity, or a grant of certification, as appropriate, prior to marketing.
"Once the deal is set and Foxconn becomes an authorized Apple supplier, Apple will no longer give any attention to worker conditions or anything that is irrelevant to its products," said Mr. Li, the former Foxconn manager.
(4 Personal computers assembled using either of the methods specified in paragraphs (c)(2) or (c)(3) of this section must, by themselves, also be authorized under Supplier's Declaration of Conformity if they are marketed.
Simco's managing director Muzaffar Siddique said his firm had subcontracted an order to an authorized Walmart supplier, which then sent the work to Tazreen without its knowledge.
Police Commissioner Raymond W. Kelly said that quality was the main factor in authorizing a supplier.
