It would be interesting to know if this was a custom API or a public one, meaning that maybe other sites are affected and their owners could use this news to protect their sites too.
Of course patching your own is top priority.
Custom API, so I don't think this affects anyone else. We've disabled betting in the meantime whilst we sort this out, but I really think the lesson to other operators is not to be overconfident in your code or in your setup.
Everything can and will be compromised, so assume it's going to happen and put safeguards in place to handle that eventual scenario.