How to connect quickbooks with website

If you only need to connect WP and QBO, you may utilize this connector.

https://www.integromat.com/?pc=quickbooks

Otherwise, you may build a webstore as connector to integrate WP and QBO. 

If your website is based on WordPress/WooCommerce then you can easily connect your website with QuickBooks by just installing the "QuickBooks Integration for WooCommerce" plugin on your site. 
Vist on WooCommerce.com  for more details.