<!--
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  "availability" : [
    "Retention Messaging API: 1.0.0 -"
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  "framework" : "RetentionMessaging",
  "identifier" : "/documentation/RetentionMessaging/promotionalOfferSignatureV1",
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  "title" : "promotionalOfferSignatureV1"
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# promotionalOfferSignatureV1

The promotional-offer signature you generate using an earlier signature version.

```
object promotionalOfferSignatureV1
```

## Discussion

To provide a promotional-offer retention message, you need to cryptographically sign the offer and include it in the [`promotionalOffer`](/documentation/RetentionMessaging/promotionalOffer) parameter of your [`RealtimeResponseBody`](/documentation/RetentionMessaging/RealtimeResponseBody) response.

> Tip: For a simpler implementation, use ``doc://com.apple.retentionmessaging/documentation/RetentionMessaging/promotionalOfferSignatureV2`` instead.

For instructions on generating the `encodedSignature` for the `promotionalOfferSignatureV1`, see
<doc://com.apple.documentation/documentation/StoreKit/generating-a-signature-for-promotional-offers>.

---

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