Taylor Swift
Taylor Swift performs during her 1989 World Tour concert in Sydney, AustraliaMark Metcalfe/Getty Images

Even as Taylor Swift's 1989 World Tour has ended, the Bad Blood singer is all happy and running to the bank. Swift not only celebrated her birthday on 13 December, but also signed a new deal with Apple Music.

The 26-year-old earned more than $240m (£157m) in gross ticket sales for her world tour. And on 13 December, the singer announced that Apple Music has bought the exclusive streaming rights of her tour film.

Responding to birthday wishes from fans, she posted a link of the trailer of The 1989 World Tour Live, which will debut on Apple Music on 20 December.

The relationship between Apple Music and Swift is a freshly salvaged one, as the two entities were not in great terms in June when the singer posted an open letter critiquing the technology giant's decision of not paying artists during its three-month free trial period.

Her post on Tumblr read: "I'm sure you are aware that Apple Music will be offering a free 3 month trial to anyone who signs up for the service. I'm not sure you know that Apple Music will not be paying writers, producers, or artists for those three months. I find it to be shocking, disappointing, and completely unlike this historically progressive and generous company."

Swift held back her album 1989 from the music streaming service because of this and added, "We don't ask you for free iPhones. Please don't ask us to provide you with our music for no compensation."

The letter did the job and a few hours later, Apple announced that it would pay the artists during the free trial period as well. And just like that, the singer was back on Apple Music.

Now that relations have been patched up, Apple is going all out to promote the concert documentary with in-store promotions, displays and special iTunes gift cards.

On 14 December, Beats 1, Apple's Internet radio station, will broadcast an interview with Swift conducted by Zane Lowe, the BBC DJ who joined Apple this year to lead the station.