//change slug to subaccouunt_code
public SubAccountFetchResponse Fetch(string idOrSlug) => _api.Get <SubAccountFetchResponse>($"subaccount/{idOrSlug}");
public TransferCheckBalanceResponse CheckBalance() => _api.Get <TransferCheckBalanceResponse>("balance");
public TransactionFetchResponse Fetch(string transactionId) =>
_api.Get <TransactionFetchResponse>($"transaction/{transactionId}");
public CustomerFetchResponse Fetch(string customerIdOrCustomerCode) =>
_api.Get <CustomerFetchResponse>($"customer/{customerIdOrCustomerCode}");
public ChargeResponse CheckPendingCharge(string reference) =>
_api.Get <ChargeResponse>($"charge/{reference}");