curl --request POST \
  --url https://api.superdoc.dev/v1/sign \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "eventId": "<string>",
  "document": {},
  "signer": {},
  "auditTrail": [
    "<any>"
  ],
  "metadata": {},
  "certificate": {}
}'

{
  "eventId": "<string>"
}