Specifies how modifications should be applied to the subscription. Exactly one field must be provided.
One-of input: provide exactly one field.
Replace all plan add-ons and discounts with the provided list.
Retain existing plan add-ons and discounts, applying only the specified changes.
input RecurringBillingSubscriptionModificationInput @oneOf {
retainExisting: RecurringBillingSubscriptionRetainExistingModificationsInput
replaceExisting: RecurringBillingSubscriptionReplaceExistingModificationsInput
}