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# additionalTransactionReason

The reason that more than one transaction represents a subscription period.

```
string additionalTransactionReason
```

## Discussion

When a group purchaser adds seats to a subscription during a subscription period, the App Store creates an additional transaction for the added seats. The additional transaction doesn’t replace the existing one. Every transaction that represents the period contains an `additionalTransactionReason`, including the transaction that existed before the group purchaser added seats. This field is absent when a single transaction represents the period.

To determine the number of seats for the period, add the [`quantity`](/documentation/AppStoreServerNotifications/quantity) of each transaction in the period, excluding any seats that a refund revoked. For more information about revoked seats, see [`revokedSeatQuantity`](/documentation/AppStoreServerNotifications/revokedSeatQuantity). For an active subscription with developer-hosted invitations, you can also call the <doc://com.apple.documentation/documentation/AppStoreServerAPI/Get-Seat-Info> endpoint. Its `totalSeatCount` is the number of seats in the current period. The group purchaser keeps access unless every transaction in the period is revoked.

---

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