You can probably use ‘git svn’ to get a copy of the code from SVN into git. Google for more help on this (as I’m no git guru) but you would be using a command like:
git svn clone -r1585632:HEAD -s --no-minimize-url https://plugins.svn.www.ads-software.com/wc-ac-hook/
There is actually very little to this plugin. It is basically 4 php files and the activecampaign api. Given the simplicity you can always just browse the code at https://plugins.svn.www.ads-software.com/wc-ac-hook/trunk/
The activecampaign api is already publicly available on git https://github.com/ActiveCampaign/activecampaign-api-php
If none of this works for you then I do have a private repository on Bitbucket with a copy (it is just the trunk, not a code mirror with SVN). I may be able to grant you access to that.