MainScreen.kt

// Get the registration options.
// 'username' here is the requested username for the new account
val registerRequestJson = getPasskeyRegisterRequestJson(username)

// Create an object which holds the options needed to create the passkey
val createPublicKeyCredentialRequest = CreatePublicKeyCredentialRequest(
    requestJson = registerRequestJson,
  
    // Pop up a UI
    preferImmediatelyAvailableCredentials = false
)

// Finally show the UI, and guide the user to creating the passkey
val createCredentialResponse = credentialManager.createCredential(
    context = localActivity,
    request = createPublicKeyCredentialRequest
)

// Make sure Credential Manager created the right kind of credential
if (createCredentialResponse !is CreatePublicKeyCredentialResponse) {
    throw Exception("Incorrect response type")
}


// The response is sent back to the server