Whenever you close a collaboration with a creator, inside their card in the Boards feature you will find the Tracking tab. Here add the link you'd like them to share with their audience.

This can be the URL to one of your products in your Shopify e-commerce only if you've already integrated your Shopify account into Heepsy (check this article on how to do this). If you use a different e-commerce software, you'll be able to track clicks but not final sales.
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Heepsy will create a dashboard inside the Tracking tab with a shortened version of the link that you have to share with the influencer. Only if the influencer shares the shortened version of the URL on their collaboration content, you will be able to see the total number of referred clicks and the total number of orders/sales (if you've integrated your Shopify e-commerce into Heepsy).