In order for Veeqo to send stock to your Shopify store you will need to enable inventory tracking on your listings, to do this follow these steps:
1. From your Shopify admin, go to Products
2. Choose All products
3. Tick the check box for all of your products and click Edit products
4. Under Add fields select the Track quantity option
5. Select Shopify tracks this product's inventory for all listings
6. Click Save.