This is an accepted solution.
Welcome to the Community. Thanks for reaching out about this.
There are two types of discounts that can be set up on your Shopify store: Discount codes or Automatic discounts. Therefore, it is possible that there is an Automatic discount created on your account, and the customer fulfilled the requirements to receive it.
To check if you have an Automatic discount enabled, please click on Discounts on the left hand side of your admin, and then the Automatic discount tab as seen here:
Any Automatic discounts will be listed here. If you do not wish to have it offered on your store at all, you can disable or delete it by following the steps in this Help Doc for Managing discounts. Additional information about Discounts, both codes and automatic can be found here.
Let me know if this helps!
Helen | Social Care @ Shopify
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