Support
Support comes from the people who wrote the extension
There are two ways to reach us, and they arrive in the same place. We answer within one business day, Monday to Friday. The same inbox answers to security@kyvero.dev, which is for reporting a security problem and nothing else. Treat any other address or site you find as not ours.
The shorter path if you already know what you want to ask. A developer reads it.
Support portal
Worth using if you would rather see the state of your request without going through your inbox. It gives you a ticket you can follow.
A request that says which extension and version, which OpenCart and PHP version, and what you expected instead of what happened can usually be answered on the first reply. The documentation lists what to include, and what never to send.