I currently own two Reolink cameras, one already supports the webhook function with the latest firmware, one does not (yet) support it.
It would be nice to have a list available, which camera model supports it already. It might have impact on buying decisions, at least for me.
What I analyzed from the firmware change logs, the following cameras support webhooks:
RLC-510A IPC_MS1NA45MP since v3.0.0.3486_2405071840
RLC-810A IPC_56064M8MP since v3.1.0.4054_2409131254
all Duo cams
RLC-840A IPC_NT2NA48MP since v3.1.0.3953_2409059414
Trackmix