Producer: Charlie Puth - Artist: Katy Perry - Producer: Johan Carlsson - Vocal Producer: Peter Karlsson - Mix Engineer: John Hanes - Mixer: Serban Ghenea - Background Vocalist: Charlie Puth - Drum Programming: Charlie Puth - Synthesizer: Charlie Puth - Vocals: Katy Perry - Background Vocalist: Johan Carlsson - Drum Programming: Johan Carlsson - Guitar: Johan Carlsson - Rhodes: Johan Carlsson - Synthesizer: Johan Carlsson - Vocal Editing: Peter Karlsson - Mastering Engineer: Dave Kutch - Asst. Recording Engineer: Jeremy Lertola - Engineer: Rachael Findlen - Engineer: Sam Holland - Engineer: Cory Bice - Engineer: Jeremy Lertola - Composer/Author: Katy Perry