Webhook as control method

I using pushbullet to create a push notification on my device.

I understand that Particle.subcribe and Particle.publish can be used together to get a data from a url. What I am wondering is, if I update my channel, Can webhook automatically read in the string update?

The idea is using pushbullet to update my channel and particle read in when there is new update, look for specific command word then execute some function automatically without having call particle.publish every time we want to read update.