Local write/read helpers for Braintree meter definitions.
Summary
Functions
@spec active_definitions_for_subscription(Ecto.UUID.t()) :: [ Accrue.Billing.MeterDefinition.t() ]
@spec get_meter_definition(String.t()) :: {:ok, Accrue.Billing.MeterDefinition.t()} | {:error, :not_found}
@spec upsert_meter_definition(String.t(), map()) :: {:ok, Accrue.Billing.MeterDefinition.t()} | {:error, Ecto.Changeset.t() | term()}