diff --git a/library/include/mobilisis/calculator_functions.h b/library/include/mobilisis/calculator_functions.h
index 373885b..cd526f4 100644
--- a/library/include/mobilisis/calculator_functions.h
+++ b/library/include/mobilisis/calculator_functions.h
@@ -58,6 +58,7 @@ public:
 
     // Daily ticket
     QDateTime GetDailyTicketDuration(Configuration* cfg, const QDateTime start_datetime, uint8_t payment_option, bool carry_over);
+    std::optional<struct price_t> GetDailyTicketPrice(Configuration* cfg, QDateTime const &startDatetime, QDateTime &endTime, PERMIT_TYPE permitType);
 
     //
     // helper function to find time steps for a tariff with PaymentMethod::Steps
@@ -66,6 +67,8 @@ public:
     QList<int> GetTimeSteps(Configuration *cfg) const;
     QList<int> GetSteps(Configuration *cfg) const { return GetTimeSteps(cfg); }
 
+    QList<int> GetPriceSteps(Configuration *cfg) const;
+
     // additional helper functions
     bool noSpecialDays(Configuration const *cfg) const {
         return (cfg->SpecialDays.size() == 0) && (cfg->SpecialDaysWorktime.size() == 0);