curl --request POST \
  --url 'https://api.nsr.stateset.com/api/v1/constraints' \
  --header 'X-API-Key: YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "description": "Cannot ship before payment received",
  "expression": "shipped(X) -> paid(X)",
  "id": "ship_after_payment",
  "source": "domain_rule",
  "strength": {
    "type": "hard"
  }
}'

{
  "description": "string",
  "expression": "string",
  "id": "string",
  "source": "string",
  "strength": {
    "type": "hard"
  }
}