atVenu can not report Download Card sales to SoundScan. The Download Card company reports the downloads to SoundScan when they are redeemed by the customer.
You can log your Download Card sales in atVenu for each show, just like you would any other music item. However, you are simply logging the sales quantities in the system so there's a record of quantity sold by show. The sales are not actually reported to SoundScan, and will not count until the Download Cards are redeemed. At that time, they must be reported by the Download Card company itself. The reported sales will apply to the current reporting period at the time the Download Card company submits their redemption report to SoundScan.
Please contact firstname.lastname@example.org and the Download Card company to ensure your download card sales are reported correctly.