public function update(array $contact_template)
    {
        if(!isset($contact_template['id'])) {
            throw new MonetivoException('$contact["type"] and $contact["id"] are required');
        }

        return $this->merchantApi->call('put', 'contacts_templates/' . $contact_template['id'], [
            'form_params' => $contact_template
        ])->toArray();
    }