In a contest, you might want to track the sales related to it. To do this, you need to add the Sales Amount item to your contest.

Step 1: Go to the 'missions' tab and click Create Mission (if you cannot see this button, your permission level does not permit you to do it, ask your administrator)

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​Step 2: Select contest, then, add your contest title, description and image.
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​Step 3: In the Contest Details, you can add any action you would like. To request users to add sales amount to their contest submission, select Enter Sales Amount, add what you'd like the users to see as the instruction for that field in-app. Finally, click Add Action.
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Done! Now, when you launch your campaign with that contest, you'll be able to see the sales associated to that contest.