０円消費型アイテムでお試し期間を実現するのはOK
お試し期間アイテムの名前は“XX-day Trial.”という命名規則でないといけない
原文
Non-subscription apps may offer a free time-based trial period before presenting a full unlock option by setting up a Non-Consumable IAP item at Price Tier 0 that follows the naming convention: “XX-day Trial.” Prior to the start of the trial,
your app must clearly identify its duration, the content or services that will no longer be accessible when the trial ends, and any downstream charges the user would need to pay for full functionality.
Learn more about managing content access and the duration of the trial period using Receipts and Device Check.