`appContext` | OPTIONAL | *string* | An optional field that allows the CDS Service to share information from the CDS card with a subsequently launched SMART app. The `appContext` field should only be valued if the link type is `smart` and is not valid for `absolute` links. The `appContext` field and value will be sent to the SMART app as part of the [OAuth 2.0][OAuth 2.0] access token response, alongside the other [SMART launch parameters](http://hl7.org/fhir/smart-app-launch/1.0.0/scopes-and-launch-context/#launch-context-arrives-with-your-access_token) when the SMART app is launched. Note that `appContext` could be escaped JSON, base64 encoded XML, or even a simple string, so long as the SMART app can recognize it. CDS Client support for `appContext` requires additional coordination with the authorization server that is not described or specified in CDS Hooks nor SMART.
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