curl -i -X POST "https://api.box.com/oauth2/revoke" \
     -H "content-type: application/x-www-form-urlencoded" \
     -d "client_id=[CLIENT_ID]" \
     -d "client_secret=[CLIENT_SECRET]" \
     -d "token=[ACCESS_TOKEN]"

client.auth.revoke_token()

await auth.revokeTokens();
// client's tokens have been revoked

try await auth.revokeToken()

auth.revokeToken();
// client's tokens have been revoked

await auth.RevokeTokenAsync();

{
  "error": "invalid_client",
  "error_description": "The client credentials are not valid"
}

{
  "error": "invalid_client",
  "error_description": "The client credentials are not valid"
}