This is the intro and verse - between the chorus and verse the song tranposes between A and Gb; at the bridge it moves to the key of C then to E and on to B for the rest of the song. I gave you a little bit of the song below, hope this helps, let me know if you have question. Don't Let the transitions through you off its a pretty basic song. Remember to practice songs you learn in every key. God Bless
Intro - Key of A
AEA/C#EA (Amaj)
Ab, A, BF#A/BDE (Dmaj9/B)
Ab, A, C#G#B/C#E (C#m7)
B, C#, AbF/FabBD
C#G#B/D#F#C# (Bmaj9/C#) - F/B –
F#E/C#EA (F#m7)
E/BEF#G# (Emaj)
D/BDF# (Bm/D)
C#/ABC#E (Amaj9/C#)
B/F#AD (Dmaj/B)
(Bass - B, C,) C#/AbBEbGb (Abm7/C#)
you will transpose off last chord to Gb
Gb/GbBbDb (Gbmaj), Db, Db
Gb, F/DbEbFAb (Dbmaj9/F), Db, Db
Gb, Eb/GbBbDb (Gbmaj/Eb), Db, Db
Bb, C#G#B/C#EG#B (C#m7) - F#E/C#EF#A# (C#m6/F#), G# –
BF#A#/BC#D#F# (Bmaj9)
BbAb/BbDbGb (Gbmaj9/B)
AbEbGb/AbBEbGb -- Transition 2nd time
Db/AbBEbGb - F/F –
Again