@classmethod
  def RecordITunesTransaction(cls, client, callback, user_id, verify_response):
    sub = Subscription.CreateFromITunes(user_id, verify_response)
    sub.Update(client, callback)
Retrieve a quota usage or raise if it does not exist.
dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/subscription.py/Subscription.RecordITunesTransaction--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/db/api.py/quota_usage_get