IPA: /rɪˈfʌndər/
KK: /rɪˈfʌndər/
A person or organization that gives back money that was previously paid, usually because a product was returned or a service was not satisfactory.
The refunder processed my request quickly after I returned the faulty item.
Refunder → It is formed from "re-" (meaning again) and "fundere" (meaning to pour or to melt). The word refers to the act of pouring back or returning money that was previously given.
Think of 'pouring back' ('fundere') money 'again' ('re-') — that's why a refunder is someone who returns money.