In-/decreasing quantity of component subscriptions

Sample request

POST /Orders

{
  "TriggerInterimBilling": false,
  "ContractId": "5e53dab7443e5516749566e2",
  "Cart": {
    "InheritStartDate": false,
    "ComponentSubscriptions": [
      {
        "ComponentId": "5e53dab7443e5516749566fb",
        "Quantity": 4.0
      }
    ],
    "EndComponentSubscriptions": [
      "5e53dab7443e5516749566fb"
    ]
  },
  "PreviewAfterTrial": false
}

If you simply want to change the quantity of a subscribed component, there is a shortcut. Subscribe to a component with the new quantity. In EndComponentSubscription pass the ComponentId instead of listing ComponentSubscriptionIds. All corresponding subscriptions will be ended. This way the new subscription will be the only existing one for the component.

Sample response

{
  "Id": "5e53dab7443e551674956710",
  "AllowWithoutPaymentData": true,
  "ComponentSubscriptions": [
    {
      "ComponentType": "QuantityBased",
      "PreventModification": false,
      "VatPercentage": 19.0,
      "TotalNet": 4.0,
      "TotalVat": 0.76,
      "IsQuantityBased": false,
      "ComponentId": "5e53dab7443e5516749566fb",
      "Quantity": 4.0
    }
  ],
  "Total": 7.0,
  "TotalVat": 1.33,
  "TotalGross": 0.0,
  "NextTotalGross": 0.0,
  "IsTrial": false,
  "TrialEndPolicy": "NoTrial",
  "Status": "InProgress",
  "OrderType": "Signup",
  "TriggerInterimBilling": false,
  "CustomerId": "5e53dab7443e551674956711",
  "ContractId": "5e53dab7443e5516749566e2",
  "PreviewAfterTrial": false
}