User requesting all substitutions available to the invoice also be available to the emails.
[INVOICE_ID], [INVOICE_NO], [ITEMS_NAME], [ITEMS_NUMBERS], [PAYMENT_STATUS], [PAYMENT_METHOD], [DATE_ORDERED], [DATE_TIME_ORDERED], [DATE_PAID], [TRANSACTION_ID], [TRANSACTION_TYPE], [CURRENCY], [TOTAL_PRICE], [TAX_AMOUNT], [ADDRESS_FIRST_NAME], [ADDRESS_LAST_NAME], [ADDRESS_COMPANY], [ADDRESS_STREET], [ADDRESS_CITY], [ADDRESS_STATE], [ADDRESS_ZIPCODE], [ADDRESS_COUNTRY], [ADDRESS_PHONE], [PAYER_EMAIL], [ADDRESS_VAT_NUMBER], [INVOICE_CONTENT_HTML] (full invoice) and [INVOICE_ITEMS_HTML] (just table and totalizers) and [BASKET_CONTENT_HTML] (content of basket with totalizers) are outputed in HTML table format, and only available in HTML mode).