public function deliver( $arg ) {
		$start_time = microtime( true );
		$payload    = $this->build_payload( $arg );

		// Setup request args.
		$http_args = array(
			'method'      => 'POST',
			'timeout'     => MINUTE_IN_SECONDS,
			'redirection' => 0,
			'httpversion' => '1.0',
			'blocking'    => true,
			'user-agent'  => sprintf( 'WooCommerce/%s Hookshot (WordPress/%s)', Constants::get_constant( 'WC_VERSION' ), $GLOBALS['wp_version'] ),
			'body'        => trim( wp_json_encode( $payload ) ),
			'headers'     => array(
				'Content-Type' => 'application/json',
			),
			'cookies'     => array(),
		);

		$http_args = apply_filters( 'woocommerce_webhook_http_args', $http_args, $arg, $this->get_id() );

		// Add custom headers.
		$delivery_id                                      = $this->get_new_delivery_id();
		$http_args['headers']['X-WC-Webhook-Source']      = home_url( '/' ); // Since 2.6.0.
		$http_args['headers']['X-WC-Webhook-Topic']       = $this->get_topic();
		$http_args['headers']['X-WC-Webhook-Resource']    = $this->get_resource();
		$http_args['headers']['X-WC-Webhook-Event']       = $this->get_event();
		$http_args['headers']['X-WC-Webhook-Signature']   = $this->generate_signature( $http_args['body'] );
		$http_args['headers']['X-WC-Webhook-ID']          = $this->get_id();
		$http_args['headers']['X-WC-Webhook-Delivery-ID'] = $delivery_id;

		// Webhook away!
		$response = wp_safe_remote_request( $this->get_delivery_url(), $http_args );

		$duration = round( microtime( true ) - $start_time, 5 );

		$this->log_delivery( $delivery_id, $http_args, $response, $duration );

		do_action( 'woocommerce_webhook_delivery', $http_args, $response, $duration, $arg, $this->get_id() );
	}