Producer: Charlie Puth - Artist: Katy Perry - Producer: Johan Carlsson - Vocal Producer: Peter Karlsson - Mixer: Phil Tan - Vocals: Katy Perry - Spoken Word: Johan Carlsson - Background Vocalist: Charlie Puth - Synthesizer: Charlie Puth - Synthesizer: Johan Carlsson - Drum Programming: Charlie Puth - Drum Programming: Johan Carlsson - Guitar: Johan Carlsson - Engineer: Rachael Findlen - Engineer: Sam Holland - Asst. Recording Engineer: Jeremy Lertola - Engineer: Bill Zimmerman - Mastering Engineer: Dave Kutch - Vocal Editing: Peter Karlsson - Composer/Author: Charlie Puth