curl --request POST \
  --url 'https://api.stateset.com/api/v1/unit-conversion-rules' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "factor": "string",
  "from_uom_id": "string",
  "product_id": null,
  "rule_type": "string",
  "to_uom_id": "string"
}'

{
  "factor": "string",
  "from_uom_id": "string",
  "id": "string",
  "product_id": null,
  "rule_type": "string",
  "to_uom_id": "string"
}