Migrating to Google Play Billing Library Version 5.1.0 - SkuDetails.getOriginalJson() equivalent

I am upgrading from Google Play Billing version 4.0.0 to version 5.1.0. In version 4 SkuDetails has the function getOriginalJson() that contains a json object that I send to my back end. I dug in the API and could not find an official equivalent in version 5.1.0.

There are 2 places where I can see that this information may be available in com.android.billingclient.api.ProductDetails - an interal JSONObject member that we are not supposed to access and as part of the toString() function where this information is appended to parsedJson. I can probably extract what I need from the toString(), but I was wondering if there something better/official.

It is accessible in class Purchase.

Purchase.getOriginalJson();

Places you can access it:

billingClient.startConnection(new BillingClientStateListener() {
    @Override
    public void onBillingSetupFinished(BillingResult billingResult) {
        if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
            QueryPurchasesParams queryPurchasesParams = QueryPurchasesParams.newBuilder().setProductType(BillingClient.ProductType.INAPP).build();
            billingClient.queryPurchasesAsync(queryPurchasesParams, (billingResult1, list) -> runOnUiThread(() -> {
                for (Purchase purchase: list) {
                    Log.d("originalJson", purchase.getOriginalJson());
                }
            }));
        }
    }

    @Override
    public void onBillingServiceDisconnected() { }
});

And:

@Override
public void onPurchasesUpdated(@NonNull BillingResult billingResult, @Nullable List<Purchase> purchases) {
    runOnUiThread(() -> {
        if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK && purchases != null) {
            for (Purchase purchase: purchases) {
                Log.d("originalJson", purchase.getOriginalJson());
            }
        }
    }
}

Good luck.