DigitalGoods

IsSupported says the function exists; Connect says there is a store behind it. An uninstalled app has the first and not the second, which is why the store UI should be gated on Connect.

@inject Bit.Butil.DigitalGoods digitalGoods

var supported = await digitalGoods.IsSupported();
var connected = await digitalGoods.Connect();   // defaults to Google Play billing

The store's own title, description and price for each item id, in the user's currency. Render these rather than a copy from your database - the price here is the number the user will actually be charged.

var items = await digitalGoods.GetDetails(["coins_100", "pro_monthly"]);

foreach (var item in items)
{
    var price = $"{item.Price?.Value} {item.Price?.Currency}";
}

ListPurchases is what is active now - unconsumed one-offs and live subscriptions - and what a client restores entitlements from after a reinstall. ListPurchaseHistory is the most recent purchase per item, consumed and expired ones included.

var active = await digitalGoods.ListPurchases();
var history = await digitalGoods.ListPurchaseHistory();

// Send purchase.PurchaseToken to the server; let the server ask the store.

Marks a purchase as used up so the item can be bought again - the coin pack the user spent. Consume only after your server has recorded what the purchase bought: consuming first and crediting second loses the purchase entirely if anything in between fails.

var consumed = await digitalGoods.Consume(purchase.PurchaseToken);