Use instance on fetchWithInstance instead of this.axios and remove method from FortniteAPIError

src/exceptions/FortniteAPIError.ts

@@ -9,7 +9,7 @@
    * The HTTP method
    */
   public method: string;
-
+  
   /**
    * The URL of the requested API endpoint
    */
@@ -35,7 +35,7 @@
     this.name = 'FortniteAPIError';
     this.message = error.error;
 
-    this.method = request.method!.toUpperCase();
+    this.method = request.method?.toUpperCase() ?? 'GET'
     this.url = request.url!;
     this.httpStatus = status;
     this.requestParams = request.params;

src/http/HTTP.ts

@@ -43,7 +43,7 @@ class HTTP {
     };
 
     try {
-      const response = await this.axios(config);
+      const response = await instance(config);
 
       return response.data;
     } catch (e) {
@@ -56,7 +56,7 @@ class HTTP {
           }
         }
 
-        throw new FortniteAPIError(e.response.data, config, e.response.status);
+        throw new FortniteAPIError(e.response.data, e.config ?? config, e.response.status);
       }
 
       throw e;