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# GetMerchantTokenUsageInformationPackageResponse

The encrypted merchant token usage information package.

```
object GetMerchantTokenUsageInformationPackageResponse
```

## Discussion

The `data` needs to be a merchant token usage information package encrypted to the `merchantTokenPublicKey` using HPKE in authorization mode with `merchantPrivateKey` and the following options:

|Option|Value                    |
|------|-------------------------|
|`KEM` |DHKEM(P-384, HKDF-SHA384)|
|`KDF` |HKDF-SHA384              |
|`AEAD`|AES-256-GCM              |

The `merchantPrivateKey` needs to correspond to the `merchantPublicKey` provided in the merchant token usage information availability notification. The `info` parameter needs to be the UTF-8 bytes of `ApplePayMerchantTokenUsageInformation_1.0` concatenated with the SHA-256 digest (in bytes) of the `merchantTokenIdentifier` (encoded using UTF-8). For the `ciphersuite`, use the `supportedCiphersuite` returned by Apple in the [`Retrieve Merchant Token Public Key`](/documentation/MerchantTokenNotificationServices/Retrieve-Merchant-Token-Public-Key).

---

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