EE3 register event

$data = array(
    "body"=>json_encode(array(
        "Registrations" => array(
            "Event"=>array(
                "id" => 1
            ),
            "id"=>"temp-reg1",
            "status"=>"approved",
            "date_of_registration"=>"2015-12-09 14:12:31",
            "final_price"=>0,
            "code"=>"1-50c67a6f172e1",
            "url_link"=>null,
            "is_primary"=>true,
            "is_group_registration"=>false,
            "is_going"=>true,
            "is_checked_in"=>false,
            "Transaction"=>array(
                "id"=>"temp-new-one3",
                "timestamp"=>"2015-12-09 14:12:31",
                "total"=>0,
                "amount_paid"=>0,
                "status"=>"complete",
                "details"=>null,
                "tax_data"=>null,
                "session_data"=>null,
                "payment_gateway"=>"Check"
            ),
            "Attendee"=>array(
                "id"=>"temp-new-one2",
                "firstname"=>"fromapi",
                "lastname"=>"fromapiman",
                "address"=>"",
                "address2"=>"",
                "city"=>"",
                "state"=>"",
                "country"=>"",
                "zip"=>"",
                "email"=>"michael@eventespresso.com",
                "phone"=>""
            ),
        )

    ))
);