Check if Affiliate got activated.

Hi @AlexTCC, 

Thanks for being a part of our community! You should be able to use customer tags to track whether a customer has used a code. From Shopify’s documentation I also found that: 

• Shopify Flow is available to Shopify Plus merchants and can help automate processes like checking whether a discount code has been used and tagging customers. You can set up a workflow that:
  1. Detects when an order is placed with a particular affiliate code.
  2. Checks if the customer has a tag indicating they have already used that code.
  3. Takes an action (e.g., send an email, notify an admin, or block further code use).

I hope this helps!

~Chloe