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もらえばいい

should have someone …

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phrase Rare #22,796
should have someone … Used after a verb in the て-form to suggest getting someone to do something. The subject is often understood from context.
JA: 分からなかったら、先生に説明してもらえばいいよ。
EN: If you don't understand, you should have the teacher explain it.

次の宇宙船がやって来るときには、友人たちに待っていてもらえばいい。

When the next spaceship comes, I can have my friends wait for me.

「その人に先に金を出してもらえばいいんじゃない？」

Why don’t you have them pay upfront?