Full POS integration of Shopify & Saasu

Full POS integrations means that wether the business uses Shopify POS or Saasu POS they all talk to each other, update inventory, book sales to the appropriate account in Saasu,

I want to go to a store and say "I can link POS, inventory, accounting and e-commerce and make them all integrated" ... pretty sure I can win me some business with a pitch like that