var obj = JSON.parse($response.body);

obj={
  "request_date_ms" : 1622445760393,
  "request_date" : "2021-05-31T07:22:40Z",
  "subscriber" : {
    "non_subscriptions" : {

    },
    "first_seen" : "2021-05-31T07:18:40Z",
    "original_application_version" : "19615",
    "other_purchases" : {

    },
    "management_url" : "itms-apps://apps.apple.com/account/subscriptions",
    "subscriptions" : {
      "VSCOANNUAL" : {
        "is_sandbox" : false,
        "period_type" : "normal",
        "billing_issues_detected_at" : null,
        "unsubscribe_detected_at" : null,
        "expires_date" : "2090-07-16T12:15:53Z",
        "grace_period_expires_date" : null,
        "original_purchase_date" : "2019-07-02T12:15:54Z",
        "purchase_date" : "2019-07-02T12:15:53Z",
        "store" : "app_store"
      }
    },
    "entitlements" : {
      "membership" : {
        "grace_period_expires_date" : null,
        "purchase_date" : "2020-11-05T07:03:11Z",
        "product_identifier" : "VSCOANNUAL",
        "expires_date" : "2090-12-05T07:03:11Z"
      }
    },
    "original_purchase_date" : "2020-12-28T17:41:34Z",
    "original_app_user_id" : "139535280",
    "last_seen" : "2021-05-31T07:18:40Z"
  }
}

$done({body: JSON.stringify(obj)});