Also started seeing this around 2025-09-05. Using the manualPrice id returned from a previous relationships/manualPrices result. Error: Request https://api.appstoreconnect.apple.com/v1/inAppPurchasePriceSchedules failed with status code 409. Related response error(s): The request failed with response code 409 ENTITY_ERROR.INCLUDED.INVALID_ID The provided entity id is invalid. The provided included entity id 'eyJzIjoiNjQ1MTIxNzg3OSIsInQiOiJVU0EiLCJwIjoiMTAwOTQiLCJzZCI6MC4wLCJlZCI6MC4wfQ' has invalid format).

The format suggested by Nobitahuang seems true. From the documentation example, it only seems needed on "some" ids. Specifically, for ids of type inAppPurchasePrices https://developer.apple.com/documentation/appstoreconnectapi/managing-in-app-purchases#Update-in-app-purchase-prices ... "manualPrices": { "data": [ { "type": "inAppPurchasePrices", "id": "${prices-id}" }, .... "included": [ { "type": "inAppPurchasePrices", "id": "${prices-id}", Adding the id inside the ${} literal works in Swift string interpolation "${\(inAppPurchasePricesId)}"

Seeing the same thing. Started for me around October 14th.