In-App Advertising (IAA) 应用内广告 In-App Purchases (IAP) 应用内付费 Identifier for Vendors (IDFV) 供应商标识符 Impressions & Impression-level Revenue Data (ILRD) 展示层级收入数据 Incrementality 增量 Install 安装 Interstitial Ads 插播广告