It is very important to note that your Shopify store is Master of Stock.
Any updates to products and/or variants in Shopify will update the item and item variants in Modalyst.
This means that Shopify controls your available inventory quantities, as well as product info. Any adjustments made to products must be made on Shopify, which will then be reflected in Modalyst.
Some examples of this are:
You unpublish an item on Modalyst
This will unpublish it on Modalyst only
The item will remain published on Shopify
You receive an order on Modalyst
The order information will be synced with Shopify and correctly accounted for on both systems
You receive an order on Shopify
The inventory quantity will be correctly accounted for on both systems
You change the price of a product on Shopify
The price change will be reflected on Modalyst