Fitbit Plugin - Subscriptions and Collection Path

We are trying to use Bubble’s plugin for Fitbit. It works great except we can’t figure out the subscription part. We are getting stuck when we try to subscribe a user using the workflow step “Add Fitbit Subscription”. According to Bubble’s documentation it accepts any id up to 50 characters. However, when I set up the step, the debugger indicates that I need to fill in the “CollectionPath” but there is no where to do this in the workflow step. Any idea how to do this with the plugin?