WalletDcApiPresentmentActivity
Presents over the W3C Digital Credentials API on Android: a browser calls navigator.credentials.get({ digital: … }), the user picks this wallet in the system sheet, and Credential Manager launches this activity. The SDK runs the exchange; this wires it to the wallet's store, branding and reader trust.
Extend it, supply sdk, and register the subclass in the manifest for androidx.credentials.registry.provider.action.GET_CREDENTIAL. Documents are registered with com.wallet.registerAsDcProvider.