MerchantSpring now lets you upload your historical DSP report.
1. Fill out the DSP upload file (this is essentially the format of a Sponsored Product campaign download), since Amazon does not make the same download available for DSP stores.
Note: For any fields in the template which are not in the report available from Amazon, just put 0 in them.
2. Log in to your MerchantSpring account and go to Marketing > Campaigns.
3. Click "Upload Campaigns"
4. In the pop-up window, select the file and click "Save"
5. Once uploaded, the data will update within 48 hours.