The undisputed evidence shows that the efforts of the plaintiff were the efficient and the procuring cause of both transactions. See Arnold v. Jowers, 102 Ga. App. 29, 30 ( 115 S.E.2d 623). While it is true that the plaintiff was no longer associated with defendant at the time the sales commissions were paid, this will not defeat plaintiff's claim. A contract by which one employs another to sell real estate must be construed according to its particular stipulations.