1. This is the WP hosted website

2. Integration point is here
The items dynamically increase as items get added to the cart, clicking it will take you to the Online Store hosted elsewhere.

3. This is the BigCommerce hosted Online Store – using the Dazzling Theme too

4. User Journey BigCommerce Store SiteGround WP Hosting 5 Items 5 4 1
User navigates back to the Website
Number of Items in Cart is now 5 4 1
User Lands on the Website
User adds items to the cart
0 Items
Number of Items in Cart is 0
User clicks on the Cart or navigates to the Online Store
User Lands on the Products page 3 2