Shopify API for integrating suppliers product info.

We need an API for a shopify plus store to pull data and images from different suppliers to display daily changes in cost, inventory, and product updates. Main supplier has detailed instructions for an API web integration. We need the developer to create the API and get it working. We want to integrate the suppliers into the Shopify store in order to avoid uploading products, pricing, and managing product changes daily to stay current with inventory quantities etc.