g purchaseToken string  >> usertoken >> string
a uuid appAccountToken

g messageId long       >> notificationKey string
a notification UUID

g notificationType int 
a notificationType string 

g startTimeMillis
a expiresDate

g startTimeMillis
a purchaseDate


---------------------------------------------------------------------------
call 1
messageId,

{
  "version":"1.0",
  "packageName":"com.some.thing",
  "eventTimeMillis":"1503349566168",
  "subscriptionNotification":
  {
    "version":"1.0",
    "notificationType":4,
    "purchaseToken":"PURCHASE_TOKEN",
    "subscriptionId":"my.sku"
  }
}
// call 2
{
  "kind": string,
  "startTimeMillis": string,
  "expiryTimeMillis": string,
  "autoResumeTimeMillis": string,
  "autoRenewing": boolean,
  "priceCurrencyCode": string,
  "priceAmountMicros": string,
  "introductoryPriceInfo": {
    object (IntroductoryPriceInfo)
  },
  "countryCode": string,
  "developerPayload": string,
  "paymentState": integer,
  "cancelReason": integer,
  "userCancellationTimeMillis": string,
  "cancelSurveyResult": {
    object (SubscriptionCancelSurveyResult)
  },
  "orderId": string,
  "linkedPurchaseToken": string,
  "purchaseType": integer,
  "priceChange": {
    object (SubscriptionPriceChange)
  },
  "profileName": string,
  "emailAddress": string,
  "givenName": string,
  "familyName": string,
  "profileId": string,
  "acknowledgementState": integer,
  "externalAccountId": string,
  "promotionType": integer,
  "promotionCode": string,
  "obfuscatedExternalAccountId": string,
  "obfuscatedExternalProfileId": string
}

//




{
notificationType:string 
subtype:string
notificationUUID:string
expiresDate:date
originalPurchaseDate:date
purchaseDate:date
revocationDate:date
}