Ruby on Rails Corona Warn App back end service - only DCC as CWA is done already

Hi, we rund covidgo.io, a website for online corona tests via telemedicine video call. We already developed a ruby on rails service in our node.js typescript back end for the Corona Warn App. The next step is the integration of the Digital Corona Certificate: https://github.com/corona-warn-app, this one in particular: https://github.com/corona-warn-app/cwa-quicktest-onboarding/wiki/Anbindung-an-CWA-mit-Verwendung-von-DCCs

Please quote only DCC as CWA is already done.