Warning: mysqli::mysqli(): (28000/1045): Access denied for user
If you receive an error when activating the WooCommerce QuickBooks Integration about Warning: mysqli::mysqli(): (28000/1045): Access denied for user, chances are your host is still using the deprecated php mysql extension.
Our plugin attempts to connect using mysqli, to get around this and roll back to using mysql, please install and activate the attached plugin below and then try activating the WooCommerce / QuickBooks Integration
Plugin File SOD QuickBooks WooCommerce – No MYSQLI