Shellbee - we have all made mistakes in this biz. I did one similar to you only the instructions said shop the drive-thruand I shopped inside, giving the award to and inside associate. I failed the shop, but I got a meal out of it. I was not blacklisted and even offered the opportunity to shop the same location a week later. As Jas said, your willingness to pay for the error speaks volumns about your credibility!
When you learn, teach, when you get, give. Maya Angelou