Refactor entry API: consolidate entry handling, update naming conventions, and enhance error reporting

public/main.php

@@ -46,7 +46,7 @@ class APICall {
 
         // Check Path
         if (!is_file(API_DIR . $path)) {
-            $this->error("API Path invalid.");
+            $this->error = "API Path invalid.";
             return false;
         }
 
@@ -58,4 +58,12 @@ class APICall {
 
         $this->response = $response;
     }
+
+    function getError() {
+        if (isset($this->error)) {
+            return $this->error;
+        }else{
+            return false;
+        }
+    }
 }