Shopify runs the shop well and themes it adequately. What it does not do is give you a campaign page that looks nothing like the shop but sells the same products.
Connect it and Vantix builds against your real catalogue — the products, the prices and the stock you already maintain, on a page you designed for one campaign.
The alternative is duplicating product data into a second system and watching the two drift apart until somebody sells something that is out of stock.
Reading the catalogue through the connector means one source of truth, and the shop stays where your operations already live.
No. It builds pages alongside the shop, against the same catalogue.
read_products is enough unless Vantix should change the catalogue.
Yes. Connectors are part of the plan; there is no separate integration fee.