payer

noun
pay·​er | \ ˈpā-ər How to pronounce payer (audio) \
variants: or less commonly payor \ ˈpā-​ər How to pronounce payor (audio) , (ˌ)pā-​ˈȯr \

Definition of payer

: one that pays especially : the person by whom a bill or note has been or should be paid He is a prompt bill payer.