payer

Pronunciation: /ˈpeɪ.ɚ/

The English word “payer” has 2 meanings listed here.

noun

One who pays; specifically, the person by whom a bill or note has been, or should be, paid.
A swaption which gives its holder the option to enter into a swap in which they pay the fixed leg and receive the floating leg.

From pay + -er (“subject of action”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.