We're happy to announce that we've officially taken Chargify Direct out of beta. Some of our largest merchants with the most recognizable names are using Chargify Direct to control the customer signup experience on their own site while offloading PCI worries by not having to process or transmit the credit card number. We're going to continue to add features to this service, but as of now, the core service is completely stable and ready for all merchants.
You can read more about the technical aspects of Chargify Direct in our docs: http://docs.chargify.com/chargify-direct-introduction
You can also generate (and regenerate) your own Chargify Direct credentials from the Settings pane of your Chargify Site. (Note that, unlike API v1 credentials, Chargify Direct credentials are per-site instead of per-account)