Let us start here, from square one. No, from Zero!

script/api/coin.cpp

@@ -0,0 +1,38 @@
+#include "coin.h"
+#include "external/LuaBridge.h"
+#include "misc/eamuse.h"
+
+using namespace luabridge;
+
+namespace script::api::coin {
+
+    int get() {
+        return eamuse_coin_get_stock();
+    }
+
+    void set(int amount) {
+        eamuse_coin_set_stock(amount);
+    }
+
+    void insert(int amount) {
+        if (amount == 1) {
+            eamuse_coin_add();
+        } else if (amount > 1) {
+            eamuse_coin_set_stock(eamuse_coin_get_stock() + amount);
+        }
+    }
+
+    bool blocker_get() {
+        return eamuse_coin_get_block();
+    }
+
+    void init(lua_State *L) {
+        getGlobalNamespace(L)
+        .beginNamespace("coin")
+            .addFunction("get", get)
+            .addFunction("set", set)
+            .addFunction("insert", insert)
+            .addFunction("blocker_get", blocker_get)
+        .endNamespace();
+    }
+}