払わせて

let (someone) pay, make (someone) pay

→ 払う
払わ to pay + せ Causative + て Te-form (conjunctive form)
verb Rare #36,273
let (someone) pay, make (someone) pay The context determines whether it means allowing someone to pay or making them pay.
JA: ここは私に払わせてください。
EN: Please let me pay here.
Conjugation of 払う

払わせてください。

Please let me pay.

じゃあここの勘定を払わせて下さい

Then please let me pay the bill here.

— 生きる (1952)

ここでツケを払わせてやる

I'll make you pay for this here.

— 荒野の用心棒 (1964)

奴に武器の代金を払わせてやる

I'll make him pay for the weapons.

— シティ・オブ・ゴッド (2002)

たっぷり払わせてもらうよ

I'll make sure to pay you plenty.