diff --git a/src/loaders/ApiBasedRepositoryLoader.ts b/src/loaders/ApiBasedRepositoryLoader.ts
index 145639a..01e9cec 100644
--- a/src/loaders/ApiBasedRepositoryLoader.ts
+++ b/src/loaders/ApiBasedRepositoryLoader.ts
@@ -1,10 +1,10 @@
 import { GetterSetterRepository } from "../repositories/GetterSetterRepository";
 import { IEta, IRoute, IShuttle, IStop, ISystem } from "../entities/entities";
 
-const systemIdsToSupport = ["263"];
-const baseUrl = "https://passiogo.com/mapGetData.php";
-
 export class ApiBasedRepositoryLoader {
+  readonly supportedSystemIds = ["263"];
+  readonly baseUrl = "https://passiogo.com/mapGetData.php";
+
   constructor(
     public repository: GetterSetterRepository,
   ) {
@@ -15,12 +15,12 @@ export class ApiBasedRepositoryLoader {
       getSystems: "2",
     };
     const query = new URLSearchParams(params).toString();
-    const response = await fetch(`${baseUrl}?${query}`);
+    const response = await fetch(`${this.baseUrl}?${query}`);
     const json = await response.json()
 
     if (typeof json.all === "object") {
       // filter down to supported systems
-      const filteredSystems = json.all.filter((jsonSystem: any) => systemIdsToSupport.includes(jsonSystem.id));
+      const filteredSystems = json.all.filter((jsonSystem: any) => this.supportedSystemIds.includes(jsonSystem.id));
       await Promise.all(filteredSystems.map(async (system: any) => {
         const constructedSystem: ISystem = {
           id: system.id,
@@ -47,7 +47,7 @@ export class ApiBasedRepositoryLoader {
       formData.set("json", JSON.stringify(formDataJsonObject));
 
       const query = new URLSearchParams(params).toString();
-      const response = await fetch(`${baseUrl}?${query}`, {
+      const response = await fetch(`${this.baseUrl}?${query}`, {
         method: "POST",
         body: formData,
       });
@@ -86,7 +86,7 @@ export class ApiBasedRepositoryLoader {
       formData.set("json", JSON.stringify(formDataJsonObject));
 
       const query = new URLSearchParams(params).toString();
-      const response = await fetch(`${baseUrl}?${query}`, {
+      const response = await fetch(`${this.baseUrl}?${query}`, {
         method: "POST",
         body: formData,
       });
@@ -114,7 +114,7 @@ export class ApiBasedRepositoryLoader {
       formData.set("json", JSON.stringify(formDataJsonObject));
 
       const query = new URLSearchParams(params).toString();
-      const response = await fetch(`${baseUrl}?${query}`, {
+      const response = await fetch(`${this.baseUrl}?${query}`, {
         method: "POST",
         body: formData,
       });
@@ -154,7 +154,7 @@ export class ApiBasedRepositoryLoader {
         };
 
         const query = new URLSearchParams(params).toString();
-        const response = await fetch(`${baseUrl}?${query}`, {
+        const response = await fetch(`${this.baseUrl}?${query}`, {
           method: "GET",
         });
         const json = await response.json();