You can clone with
HTTPS or Subversion.
Looking at your code here I see you've found a bug that has been fixed during the last months of development and will gain common use by next stable release acct_mgr-0.4
So this will still not hurt to keep it for older plugin applications, but you may want to adapt your developer comment in the code.
Thanks. I'm not using trac anymore though so I'm unlikely to touch this project anymore. I should add a note to the README to that effect.