Adding packages to Invoicing via link

Hello,

Using WPGD (full membership) and now testing integration with Invoicing.

I’d like to add a link on a page that when clicked adds a specific package to the Invoicing Checkout and redirects the user to then checkout.

Basically like using /cart/?add-to-cart=123456 URL with woocommerce.

I could create WPGD packages as products in Woocommerce and do it all via WC, but I might like to start using WPInvoicing with some other services we provide so I thought I would see if I could incorporate that workflow.

Is it possible to use WPGD and Invoicing to make this happen?

Thanks.