First of all, thank you for the great plugin! We've just started our business and it's been a great start, our customers have specifically mentioned how great it is being able to book cleaning services this easily! 
Now, I'm not a coder but I've leveraged AI to create some other scripts that has worked in cart. For example I have a script that adds a material cost, depending on the subtotal of the product made by Amelia.
(I'm selling cleaning services)
Now, we've expanded and when customers books in Amelia, they can choose between many nearby cities. Some cities are 30-50 minutes away, and I would like to add a transportation cost (a virtual product) depending on what city they choose.

I've tried the WP Hooks like amelia_after_location_added but it doesn't seem to work. I assume it's because when in cart page, there hasn't been a booking added yet? An example of code I've tried: 

function add_transportation_fee_for_falun($location) {
// Check if the location is "Falun"
if (stripos($location, 'Falun') !== false) {
// Product ID for the transportation fee $product_id = 5424; $price = 80;

// Get the product $product = wc_get_product($product_id);

// Ensure the product exists and is valid
if ($product) {
// Add the product to the cart with the specified price
$cart_item_data = array(
'price' => $price,
'custom_price' => $price,
);
WC()->cart->add_to_cart($product_id, 1, 0, array(), $cart_item_data);
}
}
}

// Hook into Amelia's action after location is added
add_action('amelia_after_location_added', 'add_transportation_fee_for_falun', 10, 1);

I've also tried it simplified to just echo "city found", but it never fires. I'm not really asking you to figure out the code for me but perhaps point me in the right direction on how I can go about identifying the city in the cart page, so that I can add a transportation cost? 

Thank you so much!! It works now and it adds transportation costs depending on what city customers choose. Adding the price with the code didn't work, so I did this instead. Created virtual transportation-cost products for each city, with a fixed price on each. (originally I had 1 "transportation cost" product with a price of 0, and hoped the code would set it's price). So code looks like this

// Function to check the location and return the product ID
function checkLocation($location) {    
    switch ($location) {
        case "Falun":            
            return 5424;
        case "Avesta":
            return 5438;
        // Add other locations and their respective product IDs here
        // case "CityName": return ProductID;
        default:
            return null;
    }
}
// Function to add the city-specific transportation product to the cart
function example($appointmentData) {
    // Load the Amelia container to access the location repository
    $container = require AMELIA_PATH . '/src/Infrastructure/ContainerConfig/container.php';
    $locationRepository = $container->get('domain.locations.repository');
    
    // Get the location object
    $locationObj = $locationRepository->getById($appointmentData['locationId']);
    
    // Get the location name (e.g., Falun)
    $location = $locationObj->getName()->getValue();
    
    // Get product ID for the chosen location
    $product_id = checkLocation($location);
    
    // If a valid product ID is found for the location, add the product to the cart
    if ($product_id) {
        $product = wc_get_product($product_id);
        
        // Ensure the product exists and is valid
        if ($product) {
            // Add the product to the cart with no additional custom data
            WC()->cart->add_to_cart($product_id, 1);
        }
    }
    
    return $appointmentData;
}