My customer has bought my products and she told me that in the order confirmation email, there is a box below the payment method/billing address info, that says "Discount for Next Purchase" along with the discount code. (She emailed me because this code doesn't work on the website.)
The code shown is a code I used to create in the 'discount' section of my shop, but already deleted it.
And I've never set up any "discount for next purchase" or marketing in this manner.
Does anyone have an idea how to disable this? Or to edit the discount code?