payme | Invoice your client in one click | Business library

I'm trying to make a Table take the data where I make condition a delete from ... to ... , the data returns one row thinner, maybe one row deleted? my code:

I am create new extension payment gateway GCash on my OpenCart 3.0.3.3. I Copy the existing concept of Bank Transfer. But once I Install the new extension i encounter the error.

Fatal error: Uncaught Error: Class 'Controllerextensionpaymentgcash' not found in C:\xampp\storage\chaguan\storage\modification\system\engine\action.php:71 Stack trace: #0 C:\xampp\storage\chaguan\storage\modification\system\engine\loader.php(48): Action->execute(Object(Registry), Array) #1 C:\xampp\htdocs\chaguan2\admin\controller\extension\extension\payment.php(27): Loader->controller('extension/payme...') #2 C:\xampp\storage\chaguan\storage\modification\system\engine\action.php(79): ControllerExtensionExtensionPayment->install() #3 C:\xampp\htdocs\chaguan2\admin\controller\startup\router.php(26): Action->execute(Object(Registry), Array) #4 C:\xampp\storage\chaguan\storage\modification\system\engine\action.php(79): ControllerStartupRouter->index() #5 C:\xampp\htdocs\chaguan2\system\engine\router.php(67): Action->execute(Object(Registry)) #6 C:\xampp\htdocs\chaguan2\system\engine\router.php(56): Router->execute(Object(Action)) #7 C:\xampp\htdocs\chaguan2\system\framework.php(165): Router->dispatch(Object(Action), Object( in C:\xampp\storage\chaguan\storage\modification\system\engine\action.php on line 71

How can I resolve following errors?

For reference this is my code:

Controller Path:

admin\controller\extension\payment\gcash.php

I have a WKWebView, the webview will load a link like https://qr.payme.hsbc.com/2/XXXXYYYZZZ.

And there two possible results when the link is loaded,
case 1 is an app called Payme will be opened when user has installed Payme app;
case 2 is webview will be redirected to a static page https://payme.hsbc.com/ when user has not installed Payme app.

My question is how can I know if the Payme app is opened?

I started working with angular almost a whole week ago. And to make things easy I am trying to implement a paypal-checkout.

The checkout works fine, as long as I only pass the total amount. But I would like to pass several items to paypal.

I tried it this way:

Hello I am trying to redirect to a php file that I created in an existing project using the header function but it is not working and I am getting 404 not found as a result.

Here is the line I wrote:

I have a string here for practice.