[TAX] - Value in tax field with currency symbol
[TAXNUM] - As per [TAX] but the value is displayed with a decimal point and no thousands separator and no currency symbols.
[COMMISSION] - Value in commission field with currency symbol
[COMMISSIONNUM] - As per [COMMISSION] but the value is displayed with a decimal point and no thousands separator and no currency symbols.
[PAYPALURL] - Creates a Paypal payment url for the amount in the booking deposit field if non zero, otherwise the outstanding balance.