Could I ask you to stand in line over here to pay?
If you're ready to pay, could you please wait in line over here?
ーCould I ask you to stand in line over here to pay?
「お会計はこちらに並んでいただけますか？」
to stand in line で「並んで立つ・列に並ぶ」
ーIf you're ready to pay, could you please wait in line over here?
「お会計の方は、こちらに並んでお待ちいただけますか？」
to wait in line で「並んで待つ」
ご参考まで！
カナダ 
