buy offers & sell offers哪个是“供”,哪个是“求”?作为供货商,我要发布信息

buy offers & sell offers哪个是“供”,哪个是“求”?作为供货商,我要发布信息的话,应该发布buy offers 还是sell offers?buy offers=buy leads,sell offers=sell leads,我之前发消息在sell offers,可是某天收到个消息问：我是要供货还是采购,害得我现在都不确定了!汗.