# quantity The quantity of the product the customer purchased in a single transaction. ``` int64 quantity ``` ## Discussion The `quantity` field applies only to purchases. Don’t include a `quantity` for refunds. Set `quantity` to `1` when a customer purchases a single product. Use a value greater than `1` when someone purchases a multiple of the same product in one transaction. > Important: Amount values always represent the total amount for the line item, not a per-item amount. The `quantity` value is not used for calculations. Multiple items may be considered a single product if they are sold as a package. For example, a 10-pack of game gems may be a single product with a quantity of `1`. If the [`productType`](/documentation/ExternalPurchaseServerAPI/productType) is `SUBSCRIPTION`, use a `quantity` greater than `1` to indicate a purchase of multiple subscriptions that renew as one, for example, a multi-seat subscription. If subscriptions can have different billing dates or renewal schedules, report them as separate line items with a `quantity` of `1`. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)