@spec retrieve(StripeElixir.Client.t(), String.t(), map(), keyword()) ::
  {:ok, term()} | {:error, StripeElixir.Error.t()}

Retrieve a cash balance

Retrieves a customer’s cash balance.

@spec update(StripeElixir.Client.t(), String.t(), map(), keyword()) ::
  {:ok, term()} | {:error, StripeElixir.Error.t()}

Update a cash balance's settings

Changes the settings on a customer’s cash balance.