Retrieve Device ID from new action dialog

My plugin needs to create a dynamic list of strings based on the device chosen in an Action Group dialog. Apologies if this is a silly question, but I need to address that particular Device ID when my method to populate the list is called. Here is my action as defined in Actions.xml:

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       <Action id="actionZP_LIST" deviceFilter="self.ZonePlayer">
                 <Name>Sonos Playlist</Name>
                <ConfigUI>
                        <Field id="setting" type="menu">
                                <Label>Sonos Playlist:</Label>
                                <List class="self" method="getZP_LIST" dynamicReload="yes"/>
                        </Field>
                </ConfigUI>
                <CallbackMethod>actionZP_LIST</CallbackMethod>
        </Action>


[jay (support)]

The signature for the dynamic list generator is this:

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 def myListGenerator(self, filter="", valuesDict=None, typeId="", targetId=0)

In the case of this method being called from a config UI for an action that requires selection of a device, the targetId parameter will be the ID of the device selected.

Thanks Jay - seems simple enough!