I would actually love to build Gandi API support into DomainMOD, as I've personally used Gandi for years and I'm a pretty big fan of theirs. To be honest I've actually attempted to integrate their API multiple times, but it's a very non-standard API, at least compared to what I'm used to/what I've been integrating into DomainMOD, and I just wasn't able to get it to work properly.
For PHP 5, Gandi's API requires the XML_RPC2 PHP package from pear, which is not actively maintained. This is one of the big reasons I chose not to add support for Gandi. I'm trying to keep the DomainMOD code clean and up-to-date, especially when dealing with required 3rd party add-ons, and using a pear package that's not actively maintained is a bit of a step backwards.
My hope is that Gandi's next API release won't be built upon an outdated framework, at which point support will be added ASAP.
I'm going to keep trying the integration, as I really do want to add Gandi support, but for the time being unfortunately it's not supported. If you would like to be notified when support is added you should subscribe via one of the methods on this page, and you will be alerted when we add Gandi support,
https://domainmod.org/subscribe/.