Read deletion outcome using its private receipt proof

curl -X POST "https://example.com/v1/access/deletion/status" \
  -H "Content-Type: application/json" \
  -d '{
    "receiptProof": "string"
  }'

{
  "state": "deleting",
  "initiatedAt": "2019-08-24T14:15:22Z",
  "receiptExpiresAt": "2019-08-24T14:15:22Z"
}