diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index 67ac6b3..060b049 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -127,13 +127,13 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg,
 
     //Get min and max time defined in JSON
     double minMin = 0;
-    minMin = cfg->PaymentOption.find(payment_option)->second.pop_min_time;
+    minMin = cfg->getPaymentOptions().pop_min_time;
 
     double maxMin = 0;
-    maxMin = cfg->PaymentOption.find(payment_option)->second.pop_max_time;
+    maxMin = cfg->getPaymentOptions().pop_max_time;
 
     double min_price = 0;
-    min_price = cfg->PaymentOption.find(payment_option)->second.pop_min_price;
+    min_price = cfg->getPaymentOptions().pop_min_price;
 
     if(price < min_price)
     {