1. Adding Your Payment Account to the Database

Payment systems generally work with API keys ( "public_key" and "secret_key" ). These key names may be different for some systems, but logically work the same way.
To add a new payment system, open the "payment_gateways" table in your database via phpMyAdmin and click the "Insert" link from the menu above to add your payment system.

You can follow these steps to add a static page to your site. "static_page" name will be used as an example, but you can change this name as you want.

1. Open  "app/Controllers/HomeController.php" file and add your function:

public function staticPage()
{
    $data['title'] = "This is a static page";
    $data['description'] = "This is a static page";
    $data['keywords'] = "static,page";

    echo view('partials/_header', $data);
    echo view('static_page', $data);
    echo view('partials/_footer');
}

2. Create a "static_page.php" file in the "app/Views" folder. You need to add your HTML and CSS codes to this file.

3. Open the "app/Config/Routes.php" file to create a route for your page. You can add the following line just after "$routes->get('/', 'HomeController::index');" line in this file:

$routes->get('/static-page', 'HomeController::staticPage');

After these edits, you can access this page with "domain.com/static-page" URL.

If PayPal is not working on your site, please follow these steps:

1. You need to create PayPal API keys with your PayPal "business" account. Your account should allow these kind of payments. After genereting your API keys, you need to enter your API keys from the "Payment Settings" section in the Admin panel.

2.  If you want to test the payment system with sandbox API keys, you need to select "Sandbox" mode in the "Payment Settings" section. If you want to add live API keys and receive the payments, you need to select "Production" mode.

3. PayPal does not work with all currencies. If you add a product with a currency that PayPal does not support, the payment window will not open. You need to use one of these currencies: