diff --git a/library/src/configuration.cpp b/library/src/configuration.cpp
index 5946521..7073051 100644
--- a/library/src/configuration.cpp
+++ b/library/src/configuration.cpp
@@ -442,7 +442,10 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 
 
 
-const ATBPaymentOption & Configuration::getPaymentOptions()
-{
+ATBPaymentOption const &Configuration::getPaymentOptions() const {
+    return this->currentPaymentOptions;
+}
+
+ATBPaymentOption &Configuration::getPaymentOptions() {
     return this->currentPaymentOptions;
 }