Why does Eilif send the Chaplain and the Cook to his mother for money? What did he want to do with the money?

The Cook and the Chaplain enter. They bring a message from Eilif who wants money. Eilif blackmails his mother into giving him money by hinting he might try to get it from his brother who is a paymaster. Mother Courage does not want Swiss Cheese to be tempted, so she pays instead.