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You can do it by simply adding 10% markup to the main service price obtained through an API. Here's how you can achieve it in Laravel:

1. Firstly, obtain the main service price from the API using the GuzzleHTTP client or any other suitable HTTP client.

2. Once you have obtained the main service price, calculate the 10% markup. You can use the following formula:

markup = main_service_price * 0.10

1. Add the markup to the main service price to obtain the total price:

total_price = main_service_price + markup

1. Return the total price to the user.

Example code:

use GuzzleHttp\Client;

public function getServicePrice()
{
    $client = new Client();
    $response = $client->get('http://api.example.com/service/price');
    $main_service_price = json_decode($response->getBody()->getContents(), true)['price'];

    // Apply 10% markup
    $markup = $main_service_price * 0.10;
    $total_price = $main_service_price + $markup;

    return $total_price;
}

Note: It is important to ensure that the API license agreement allows for the additional markup to be applied to the service price.