returns the billing id . concode_field_sep double taxesPercentage concode_elem_sep long billingId concode_elem_sep String productId concode_elem_sep String title concode_elem_sep Date transactionDate concode_elem_sep String transactionId concode_elem_sep String cancelledTransactionId concode_elem_sep String cancellationTransactionId concode_elem_sep double price concode_elem_sep String taxesCountry concode_elem_sep String customerId concode_elem_sep PaymentMethod paymentMethod concode_elem_sep double taxesAmount concode_elem_sep String currency concode_elem_sep TransactionStatus status concode_field_sep String getCurrency concode_elem_sep double getTaxesPercentage concode_elem_sep String getCancelledTransactionId concode_elem_sep String getCancellationTransactionId concode_elem_sep TransactionStatus getStatus concode_elem_sep String getCustomerId concode_elem_sep double getPrice concode_elem_sep String getTaxesCountry concode_elem_sep String getProductId concode_elem_sep PaymentMethod getPaymentMethod concode_elem_sep String getTitle concode_elem_sep String getTransactionId concode_elem_sep Date getTransactionDate concode_elem_sep double getTaxesAmount
long function ( ) { return billingId ; }