curl --request POST \
  --url https://api.revolv3.com/api/Subscriptions/{subscriptionId}/billing-plans \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json-patch+json' \
  --data '{
  "name": "New Billing Plan",
  "value": 5.99,
  "cycleCount": 12,
  "valueType": "Standard",
  "startCycleDelay": 0
}'

{
  "subscriptionId": 1,
  "customerId": 1,
  "merchantSubscriptionRefId": "1234-5678-9101",
  "networkTransactionId": null,
  "billingIntervalType": "Months",
  "billingIntervalCount": 1,
  "subscriptionStatusType": "Current",
  "subscriptionCancelType": "Immediate",
  "initialBillDate": "31-Oct-25",
  "nextBillDate": "30-Nov-25",
  "taxAddress": null,
  "paymentMethodIds": [
    1,
    2
  ],
  "cancelledAt": null,
  "billingPlans": [
    {
      "subscriptionBillingPlanId": 1,
      "subscriptionId": 0,
      "name": "Billing Plan 1",
      "value": 10.99,
      "startDate": "31-Oct-25",
      "cyclesRemaining": -1,
      "cycleCount": 0,
      "valueType": "Standard"
    },
    {
      "subscriptionBillingPlanId": 2,
      "subscriptionId": 0,
      "name": "Billing Plan 2",
      "value": 14.99,
      "startDate": "30-Nov-25",
      "cyclesRemaining": 12,
      "cycleCount": 0,
      "valueType": "Standard"
    }
  ],
  "message": null,
  "paymentProcessor": null,
  "processorMerchantId": null,
  "processorRawResponse": null,
  "currency": null,
  "responseMessage": null,
  "responseCode": null
}