Unable to Determine Owner of Webhook CRC Validation Request

When creating webhook subscriptions for multiple Zoom accounts, they cannot share one endpoint because the payload of the CRC validation request just includes “plainToken,” and does not include the account_id like all other webhook payloads, meaning I cannot deterministically know which secret token I need to use to respond to the validation event.
Anyone have any solutions besides simply having to create an endpoint to subscribe to for each Zoom account using our service?