Create a contact
Creates a contact, optionally adding it to a group. Set update_if_exists to update an
existing contact with the same number instead of creating a duplicate.
POST
https://app.touchsms.com.au/api/v2/contactsCreates a contact, optionally adding it to a group. Set update_if_exists to update an
existing contact with the same number instead of creating a duplicate.
https://app.touchsms.com.au/api/v2/contacts