This is by far their worst service update of all-time.
COMC announced today they're discontinuing support for unscratched redemption cards as of January 15th, 2020. If they receive unscratched redemption cards postmarked after that date, it will be uploaded into your account as an unsupported item and be assessed their standard processing fee.
To make matters worse, you'll need to have any unscratched redemption cards shipped back to you, where per-item fees will apply.
They ensured any previously scratched redemption cards on their website will continue to be supported with no additional fees.
Editors opinion: This is highly disappointing considering they offered the only safe way to sell redemption cards online to strangers. They should have charged more for their service rather than ending it entirely.
- James Good. "Important Service Update: Discontinuing Redemption Fulfillment." COMC.com. January 9, 2020.