what are some products she has endorsed?
Diet Coke, Keds sneakers, Instax camera, to name a few.
Taylor Swift
She became a spokesmodel for Diet Coke, and Keds sneakers, released her third Elizabeth Arden fragrance, named Taylor by Taylor Swift, and continued her partnerships with Sony Electronics and American Greetings. 
when did taylor swift became a pop singer In the year 2004, at the age of 14. what was her debut album called? "Taylor Swift" when was it released? October 24, 2006
wiki:15636802
Taylor Swift [SEP] Product endorsements
While promoting "Reputation", Swift released a series of behind-the-scenes videos showing the album recording process through DirecTV. In 2018, Swift released two commercials for AT&T. The same year, Swift partnered with UPS as an official delivery partner for "Reputation" and Fujifilm on a special-edition autographed Instax camera, which includes a selfie-mode and double exposure. The cameras showed massive growth in sales after partnership with Swift. In 2019, Swift signed a multi-year partnership with Capital One, and released a sustainable fashion clothing line with Stella McCartney.