Subscribe new webhook

curl --request POST \
  --url https://api.hystruct.com/v1/integrations/webhooks/subscribe \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "workflowId": "<string>",
  "webhookUrl": "<string>",
  "events": [
    "<any>"
  ]
}'

{
  "message": "<string>"
}