That makes sense!
I actually made a change to include a settings page, where you can set the endpoint on a per-site basis… as well as set the secret key on a per-site basis.
I was going to commit it to GitHub but it looks like both the develop and master branch are different from what is on www.ads-software.com – and it seems like neither are stable (they both fail to work at the preflight stage).
I’d be more than happy to submit a pull request with my changes, if you let me know which one is the ‘stable’ version?
