curl--location--requestPOST'https://api.io.pagopa.it/api/v1/messages/FISCAL_CODE' \--header 'Ocp-Apim-Subscription-Key: __YOUR_API_KEY__' \--header 'Content-Type: application/json' \--data-raw '{kcontent": {"subject": "A new message subject","markdown": "A message body markdown Lorem ipsu xxxxxxx dsdfsdfdsfsdfsdfsdfdsfdsfasdasdasd on min 80 character"}}'