If you do not have a Reseller ID you can acquire one while purchasing a Dropbox subscription from Ingram Micro’s Cloud Marketplace.
Resellers must have a Dropbox-issued Reseller ID for purchasing Dropbox subscriptions. You can find Dropbox services plans on the Ingram Micro Cloud Marketplace (CMP) by selecting the option CLOUD SERVICES > COMMUNICATION AND COLLABORATION. Purchasing Dropbox from the Ingram Micro Cloud Marketplace You can click on links for detailed instructions related to the highlighted point. The Dropbox Starter Guide summarizes important features and functions which enable Customers to begin using their Dropbox subscriptions.