curl --request DELETE \
  --url https://{cluster}.voucherify.io/v1/templates/campaigns/{campaignTemplateId} \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>'

{
  "code": 404,
  "key": "not_found",
  "message": "Resource not found",
  "details": "Cannot find campaign_template with id camp_tpl_zLtn2H9fgcG3NwO7t4PAfHc",
  "request_id": "v-0f6d3efe61099b2824",
  "resource_id": "camp_tpl_zLtn2H9fgcG3NwO7t4PAfHc",
  "resource_type": "campaign_template"
}