Your suppliers send spreadsheets. PriceBridge reads them, matches the rows to the products in your store, and keeps your prices and stock current.
Products, variants, inventory and locations — that is the whole list. PriceBridge does not read your orders and does not read your customers, so none of your shoppers' data passes through it.
The one thing it writes back, and only when you confirm it item by item, is a product's SKU — and never over a SKU you already have.
PriceBridge runs inside your Shopify admin. Install it from the Shopify App Store, open it, and the first screen walks you through the catalogue import.