post https://api.whippy.co/v1/leads
Creates a lead contact, an inbound message, a contact event with type api_lead,
and optionally an outbound message. The outbound message can be optionally scheduled.
If the contact exists and is opted out, only an inbound message and an event will be created.
Passing a phone number that is already used by an existing contact would get the existing contact.
It would not try to create a new contact with a duplicate phone number.
Callback