A supplementary payment made to cover a shortfall or additional amount due (payment made later to settle a difference).
請求書の誤りで足りなかった分は追い払いで対応してください。
Please handle the missing amount on the invoice by making a supplementary payment.
会費の不足分は次回集金時に追い払いをお願いします。
Please make the supplementary payment for the missing membership fee at the next collection.