Subscription with the BillingService

Hi,
I like to use the implementation for the `BillingService`. I have a question about the Android implementation.

When the procedure reads the `BillingClient.ProductType.Inapp`, the list of products from the store is fine. In the Google Play Console, to define a subscription, there are 2 steps. In the first one, I define the name and Id of the subscription.

And then, I can define one or more plans.

When the query is built in the function `GetPlatformProductsAsync` for `BillingService.Android.cs`, I changed it like this code:

```
foreach (var product in baseProducts)
{
var queryProduct = QueryProductDetailsParams.Product.NewBuilder()
.SetProductId(product.Id)
.SetProductType(BillingClient.ProductType.Subs)
.Build();

productList.Add(queryProduct);
}
```

The query find the main subscription (liuannual1) but not the plans (base1 and base12). How do I have to refer to them in order to find them?