curl --request PUT \
  --url https://{cluster}.voucherify.io/v1/templates/campaigns/{campaignTemplateId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>' \
  --data '{
  "name": "<string>",
  "description": "<string>"
}'

{
  "id": "camp_tpl_zLtn2H9fgcG3NwO7t4PAfHcq",
  "name": "Happy Hours Winter Template",
  "description": "Template for a Happy Hours campaign with discount coupons for the winter season.",
  "campaign_type": "DISCOUNT_COUPONS",
  "created_at": "2019-09-09T09:09:09.009Z",
  "updated_at": "2019-09-09T19:09:09.009Z",
  "object": "campaign_template"
}