更新情報：商品価格設定API v2022-05-01のgetCompetitiveSummaryオペレーションの機能が拡張されました

The getCompetitiveSummary operation now includes WasPrice, which is the 90-day median price that customers pay for the product on Amazon. You can use this value to set promotions and discounts based on the typical price on the product detail page. You can find WasPrice in the referencePrices list in the operation response. To learn more about querying WasPrice, refer to CompetitiveSummaryIncludedData (referencePrices).