Update a subscription discount

curl --request PATCH \
  --url https://api.juo.io/admin/v1/subscriptions/{subscriptionId}/discounts/{discountId} \
  --header 'Content-Type: application/json' \
  --header 'X-Juo-Admin-Api-Key: <api-key>' \
  --data '{
  "target": {
    "type": "shipping"
  },
  "value": {
    "amount": 123,
    "type": "fixed-amount",
    "appliesOnEachItem": true
  },
  "recurringCycleLimit": null
}'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "resource": "subscription-discount",
  "title": null,
  "target": {
    "type": "shipping"
  },
  "value": {
    "amount": 123,
    "type": "fixed-amount",
    "appliesOnEachItem": true
  },
  "recurringCycleLimit": null
}