function delete_webhook( $mode = '' ) {
  if ( empty( $mode ) ) {
    $mode = edd_is_test_mode() ? API::MODE_SANDBOX : API::MODE_LIVE;
  }

  $webhook_name = sanitize_key( 'edd_paypal_commerce_webhook_id_' . $mode );
  $webhook_id   = get_option( $webhook_name );

  // Bail if webhook was never set.
  if ( ! $webhook_id ) {
    return;
  }

  $api = new API( $mode );

  $api->make_request( 'v1/notifications/webhooks/' . urlencode( $webhook_id ), array(), array(), 'DELETE' );

  // Delete the webhook ID.
  delete_option( $webhook_name );

  if ( 204 !== $api->last_response_code ) {
    throw new API_Exception( sprintf(
    /* Translators: %d - HTTP response code. */
      __( 'Invalid response code %d while deleting webhook.', 'easy-digital-downloads' ),
      $api->last_response_code
    ) );
  }
}