curl --request POST \
  --url https://api.juo.io/admin/v1/subscriptions/{subscriptionId}/items \
  --header 'Content-Type: application/json' \
  --header 'X-Juo-Admin-Api-Key: <api-key>' \
  --data '{
  "price": 1,
  "variant": "<string>",
  "quantity": 2,
  "recurringCycleLimit": null
}'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "resource": "subscription-item",
  "title": "<string>",
  "subtitle": null,
  "quantity": 2,
  "totalPrice": 1,
  "variant": "<string>",
  "recurringCycleLimit": null
}