How can I clear the transactions of a sandbox account ?

I'm testing an auto-renewed subscription in my app via TestFlight. The problem is that I can't find anywhere to cancel the subscription. If I go to Settings -> App Store -> Apple ID under "Sandbox account" -> Manage, it shows the subscription as Expired (since yesterday). However when I query verifyReceipt with exclude-old-transactions set to true, it still gives a status of 0, meaning the transaction is valid.

Am I not verifying this correctly ?

A status of 0 would mean the receipt is valid, it would not inform you of the status of the subscriptions/purchases represented by the receipt.

"Either 0 if the receipt is valid, or a status code if there’s an error. The status code reflects the status of the app receipt as a whole."

https://developer.apple.com/documentation/appstorereceipts/responsebody

How can I clear the transactions of a sandbox account ?
 
 
Q