mutation RegisterWebPushSubscription($input: RegisterWebPushSubscriptionInput!) {
  registerWebPushSubscription(input: $input) {
    configured
    publicKey
    subscriptionCount
  }
}

{
  "input": {
    "endpoint": "string",
    "p256dh": "string",
    "auth": "string"
  }
}

{
  "data": {
    "registerWebPushSubscription": {
      "configured": true,
      "publicKey": "string",
      "subscriptionCount": 1
    }
  }
}