"campaign_id" property does not appear in Vouchers types

[cbertozzi]

Affected version: 2.0.0

when a Voucher is created after publication, a "voucher.created" event type is pushed in configured webhooks with a "voucher" object as data and in this object there is a "campaign_id" property that is not present in any of the "Vouchers" types present in Vouchers.d.ts declarations

is this property missing in types or is deprecated in all sent events?