---
title: signature
framework: storekit
role: symbol
role_heading: Instance Property
path: storekit/product/subscriptionoffer/signature/signature
---

# signature

A cryptographic signature your server generates to sign a promotional offer for an auto-renewable subscription.

## Declaration

```swift
var signature: Data
```

## See Also

### Getting signature elements

- [keyID](storekit/product/subscriptionoffer/signature/keyid.md)
- [nonce](storekit/product/subscriptionoffer/signature/nonce.md)
- [timestamp](storekit/product/subscriptionoffer/signature/timestamp.md)