import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: 'My API Key',
});

const customStorageCredential = await client.customStorageCredentials.update('connection_id', {
  backend: 'gcs',
  configuration: {},
});

console.log(customStorageCredential.connection_id);

{
  "data": {
    "backend": "gcs",
    "configuration": {
      "credentials": "OPAQUE_CREDENTIALS_TOKEN",
      "bucket": "example-bucket"
    }
  },
  "connection_id": "1234567890",
  "record_type": "custom_storage_credentials"
}