Is there a possibility to find out which customer or in which order the special coupon code was used?
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Go to, Magento Admin > Reports > Sales > Coupons
In this section, you can see how many times a particular discount code was used, the amount of sales generated for and the amount of total discount given for each as well. You can filter it down by day, month, year etc. You can also filter by order status and for a certain date period.
Welcome to the forum, @wolfgang007 - the information the previous poster gave is correct - that's how you can view a report of coupon usage. However, it looks like you're hoping to see the exact customer or order a coupon was used in. That report doesn't show you that, unfortunately. It'll show you, for instance, how many times a given coupon was used on a given day. But it won't show you which exact order the coupon was used in.
In order to see which specific order a coupon was used in, you'd need to follow the instructions that the previous poster gave to find which day(s) the coupon had been used on. Then, you'll have to look at each individual order to see which order the coupon was used on. When viewing an order, if a coupon was used on it, you'll see it listed under 'Order Totals' on the bottom right of the page when you view the details of an order. It'll show the display name of the coupon and the discount the customer received.
There's not a simple way, however, to view a list of every specific order that used a specific coupon code in 'stock' Magento 1.