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支払わなければ

if (someone) doesn't pay

→ 支払う
支払わ pay + なけれ Negative conditional + ば Conditional (if/when)
verb · necessitative Rare #38,494
if (someone) doesn't pay A negative conditional form meaning “if ... does not pay.”
JA: 期限までに支払わなければ、注文はキャンセルされます。
EN: If you don't pay by the deadline, the order will be canceled.
Conjugation of 支払う
Necessitative
支払わなければ

家賃は明日支払わなければならない。

The rent has to be paid tomorrow.

勘定は今日支払わなければならない。

The bill must be paid today.

誰かがそれを支払わなければいけない。

Someone has to pay for it.