request
The Digital Credentials API request in intent, the one Credential Manager started the activity with: its first OpenID4VP request, else its first org-iso-mdoc one. Null when there's none, or when the caller's origin can't be established — a browser not on privilegedBrowsers (Credential Manager's JSON allowlist of browsers trusted to report a page's origin, such as the one Google publishes for Chrome), or an app without a signing certificate. A wallet answers a null with failure.