This will allow you to get all the Subscriptions that the lead has done in Kartra.
* Required: the CMD parameter must be included in the API call.
** Either the ID or the EMAIL must be passed in order to locate the lead
Here is an example:
'lead' => [ 'email' => 'firstname.lastname@example.org' ], 'actions' => [ '0' => [ 'cmd' => 'get_subscriptions_from_lead' ], ]