Attempt capture on custom gateway module isn't working

[njutn95]

I've been developing a custom token gateway module, but I'm stuck on creating a function to be called on Invoice Attempt Capture button. I didn't find it anywhere inside WHMCS docs, but but my best guess is that it should call `_capture` function. I've tried adding a blank function with default return array, added some logging to see if it goes inside the function but to avail. Please advise if there are some useful docs on this as I keep banging my head on it.

Thanks in advance,
Viktor