Persist and retrieve player progression data using Unity Cloud Save and grant virtual currency with Unity Economy

Steps

1. Install com.unity.services.cloudsave and com.unity.services.economy via Package Manager; initialize Unity Services and authenticate the player before calling either API.
2. Save player data by calling CloudSaveService.Instance.Data.Player.SaveAsync with a dictionary of string keys and serializable value objects; keys are scoped per player.
3. Load data with CloudSaveService.Instance.Data.Player.LoadAsync, specifying a set of keys or using LoadAllAsync; deserialize the returned SaveItem values into your game model.
4. In the Economy dashboard, define currencies (virtual currency with an initial balance) and inventory items; publish the configuration before the SDK can reference them.
5. Grant or deduct currency using EconomyService.Instance.PlayerBalances.IncrementBalanceAsync or DecrementBalanceAsync with the currency ID and amount.
6. Purchase items defined in Economy using EconomyService.Instance.Purchases.MakeVirtualPurchaseAsync to atomically deduct cost currency and grant item inventory in one server-validated call.