curl --request POST \
  --url https://app.flowglad.com/api/v1/pricing-models \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "pricingModel": {
    "isDefault": true,
    "name": "<string>"
  },
  "defaultPlanIntervalUnit": "day"
}'

{
  "pricingModel": {
    "id": "<string>",
    "createdAt": 0,
    "updatedAt": 0,
    "livemode": true,
    "organizationId": "<string>",
    "isDefault": true,
    "name": "<string>"
  }
}