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# advancedCommerceData

A Base64-encoded JSON object which contains a JWS with information describing an offer or switch-plan recommendation.

```
string advancedCommerceData
```

## Discussion

This property is a part of the [`advancedCommerceInfo`](/documentation/RetentionMessaging/advancedCommerceInfo). For more information on the Advanced Commerce API (ACA), see <doc://com.apple.documentation/documentation/AdvancedCommerceAPI>.

See <doc://com.apple.documentation/documentation/StoreKit/sending-advanced-commerce-api-requests-from-your-app> for how to construct this object. Pass the Base64-encoded advancedCommerceRequestData object as a UTF-8 string as [`advancedCommerceData`](/documentation/RetentionMessaging/advancedCommerceData). Use <doc://com.apple.documentation/documentation/AdvancedCommerceAPI/SubscriptionModifyInAppRequest> with a single <doc://com.apple.documentation/documentation/AdvancedCommerceAPI/SubscriptionModifyChangeItem> provided when constructing the advancedCommerceRequestData.

For more information on the structure of JWS objects, see <doc://com.apple.documentation/documentation/StoreKit/generating-jws-to-sign-app-store-requests>.

---

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