diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index e7149be..767bf54 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -1569,24 +1569,26 @@ QList<int> Calculator::GetPriceSteps(Configuration * /*cfg*/) const {
     return QList<int>();
 }
 
-QList<int> Calculator::GetTimeSteps(Configuration *cfg) const {
-    if (m_timeSteps.size() > 0) {
+QList<int> Calculator::GetTimeSteps(Configuration *cfg, int paymentOptionIndex) const {
+    qCritical() << "(" << __func__ << ":" << __LINE__ << ")" << "paymentOptionIndex:" << paymentOptionIndex;
+
+    if (m_timeSteps.size() > paymentOptionIndex) {
         //qCritical() << __PRETTY_FUNCTION__ << "timeSteps:" << m_timeSteps;
-        return m_timeSteps;
+        return m_timeSteps[paymentOptionIndex];
     }
 
     QDateTime start = QDateTime::currentDateTime();
     start.setTime(QTime(start.time().hour(), start.time().minute(), 0));
 
-    int const pop_id = cfg->getPaymentOptions().pop_id;
-    int const pop_carry_over = cfg->getPaymentOptions().pop_carry_over;
-    int const pop_time_step_config = cfg->getPaymentOptions().pop_time_step_config;
+    int const pop_id = cfg->getPaymentOptions(paymentOptionIndex).pop_id;
+    int const pop_carry_over = cfg->getPaymentOptions(paymentOptionIndex).pop_carry_over;
+    int const pop_time_step_config = cfg->getPaymentOptions(paymentOptionIndex).pop_time_step_config;
 
     static PaymentMethod const paymentMethodId = Utilities::getPaymentMethodId(cfg);
 
-    qCritical() << __func__ << ":" << __LINE__ << "       start parking time:" << start.toString(Qt::ISODate);
-    qCritical() << __func__ << ":" << __LINE__ << "        payment option id:" << pop_id;
-    qCritical() << __func__ << ":" << __LINE__ << "payment option carry over:" << pop_carry_over;
+    qCritical() << "(" << __func__ << ":" << __LINE__ << ")        start parking time:" << start.toString(Qt::ISODate);
+    qCritical() << "(" << __func__ << ":" << __LINE__ << ")         payment option id:" << pop_id;
+    qCritical() << "(" << __func__ << ":" << __LINE__ << ") payment option carry over:" << pop_carry_over;
 
     if (pop_time_step_config == (int)ATBTimeStepConfig::TimeStepConfig::DYNAMIC) {
         //qCritical() << __PRETTY_FUNCTION__ << "payment option time step config:" << "TimeStepConfig::DYNAMIC";
@@ -1595,13 +1597,13 @@ QList<int> Calculator::GetTimeSteps(Configuration *cfg) const {
             std::size_t const s = cfg->TimeRange.size();
             for (std::size_t id = 1; id <= s; ++id) {
                 int const step = Utilities::getTimeRangeStep(cfg, id, paymentMethodId);
-                m_timeSteps.append(step);
+                m_timeSteps[paymentOptionIndex].append(step);
             }
         } else {
             uint16_t timeStepCompensation = 0;
 
             if (pop_carry_over) {
-                int const pop_carry_over_time_range_id = cfg->getPaymentOptions().pop_carry_over_time_range_id;
+                int const pop_carry_over_time_range_id = cfg->getPaymentOptions(paymentOptionIndex).pop_carry_over_time_range_id;
                 QTime const carryOverTimeRangeFrom = cfg->TimeRange.find(pop_carry_over_time_range_id)->second.time_range_from;
                 QTime const carryOverTimeRangeTo = cfg->TimeRange.find(pop_carry_over_time_range_id)->second.time_range_to;
 
@@ -1625,19 +1627,19 @@ QList<int> Calculator::GetTimeSteps(Configuration *cfg) const {
                                                 .arg(timeStep).arg(duration.pun_duration_max);
                                         break;
                                     }
-                                    qCritical() << __PRETTY_FUNCTION__ << "configured minimal parking time:" << cfg->getPaymentOptions().pop_min_time;
+                                    qCritical() << "(" << __func__ << ":" << __LINE__ << ") configured minimal parking time:" << cfg->getPaymentOptions(paymentOptionIndex).pop_min_time;
 
                                     // set dynamic minimal parking time
                                     cfg->getPaymentOptions().pop_min_time = timeStep;
 
-                                    qCritical() << __PRETTY_FUNCTION__ << "  computed minimal parking time:" << cfg->getPaymentOptions().pop_min_time;
+                                    qCritical() << "(" << __func__ << ":" << __LINE__ << ") computed minimal parking time:" << cfg->getPaymentOptions(paymentOptionIndex).pop_min_time;
 
                                     duration.pun_duration = timeStep;
                                     timeStepCompensation = duration.pun_duration_max - duration.pun_duration;
-                                    m_timeSteps << duration.pun_duration;
+                                    m_timeSteps[paymentOptionIndex] << duration.pun_duration;
                                 } else {
                                     duration.pun_duration = duration.pun_duration_max - timeStepCompensation;
-                                    m_timeSteps << duration.pun_duration;;
+                                    m_timeSteps[paymentOptionIndex] << duration.pun_duration;;
                                 }
 
                                 cfg->Duration.erase(search);
@@ -1658,19 +1660,26 @@ QList<int> Calculator::GetTimeSteps(Configuration *cfg) const {
             }
         }
     } else {
-        qCritical() << __PRETTY_FUNCTION__ << "payment option time step config:" << "TimeStepConfig::STATIC";
+        qCritical() << "(" << __func__ << ":" << __LINE__ << ") payment option time step config:" << "TimeStepConfig::STATIC";
 
         for (auto[itr, rangeEnd] = cfg->PaymentRate.equal_range(pop_id); itr != rangeEnd; ++itr)
         {
             int const durationId = itr->second.pra_payment_unit_id;
             int const durationUnit = cfg->Duration.find(durationId)->second.pun_duration;
-            m_timeSteps << durationUnit;
+            int size = m_timeSteps.size();
+
+            while (size <= paymentOptionIndex) {
+                m_timeSteps.push_back(QList<int>());
+                size = m_timeSteps.size();
+            }
+
+            m_timeSteps[paymentOptionIndex] << durationUnit;
         }
     }
 
-    qCritical() << __PRETTY_FUNCTION__ << "NEW timeSteps:" << m_timeSteps;
+    qCritical() << "(" << __func__ << ":" << __LINE__ << ")" << "NEW timeSteps:" << m_timeSteps;
 
-    return m_timeSteps;
+    return m_timeSteps[paymentOptionIndex];
 }
 
 uint32_t Calculator::GetPriceForTimeStep(Configuration *cfg, int timeStep) const {