$taxTerm = CRM_Utils_Array::value('tax_term', $invoiceSettings);
$displayOpt = CRM_Utils_Array::value('tax_display_settings', $invoiceSettings);
$invoicing = CRM_Utils_Array::value('invoicing', $invoiceSettings);
$taxTerm = CRM_Utils_Array::value('tax_term', $invoiceSettings);
$displayOpt = CRM_Utils_Array::value('tax_display_settings', $invoiceSettings);
$invoicing = CRM_Utils_Array::value('invoicing', $invoiceSettings);