Creating a Sponsored Content campaign is a full service experience. Our team will work with you to properly setup and target these ads on your behalf. To help expedite the process though below are the general guidelines for display banner image sizes needed to power these campaigns.
Desktop: 728 x 90 px
Mobile: 320 x 100 px
Please contact ShopSimon™ Seller Support if you have any questions or need additional information - sellersupport@shopsimon.com