代辦商 代理商 銷售中間人 歐盟代理商指令 媒介代理 締約代理 佣金 歸入權 補償請求權 賠償請求權 Handlungsagent Commercial agent Sales intermediaries Council directives 86/653/EEC of 18 December 1986 on the coordination of the laws of the Member States relating to sele-employed commercial agents Commission Discorgement Indemnity Compensation