<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Contracts\Service;

/**
 * A ServiceSubscriber exposes its dependencies via the static {@link getSubscribedServices} method.
 *
 * The getSubscribedServices method returns an array of service types required by such instances,
 * optionally keyed by the service names used internally. Service types that start with an interrogation
 * mark "?" are optional, while the other ones are mandatory service dependencies.
 *
 * The injected service locators SHOULD NOT allow access to any other services not specified by the method.
 *
 * It is expected that ServiceSubscriber instances consume PSR-11-based service locators internally.
 * This interface does not dictate any injection method for these service locators, although constructor
 * injection is recommended.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
interface ServiceSubscriberInterface
{
    /**
     * Returns an array of service types required by such instances, optionally keyed by the service names used internally.
     *
     * For mandatory dependencies:
     *
     *  * ['logger' => 'Psr\Log\LoggerInterface'] means the objects use the "logger" name
     *    internally to fetch a service which must implement Psr\Log\LoggerInterface.
     *  * ['loggers' => 'Psr\Log\LoggerInterface[]'] means the objects use the "loggers" name
     *    internally to fetch an iterable of Psr\Log\LoggerInterface instances.
     *  * ['Psr\Log\LoggerInterface'] is a shortcut for
     *  * ['Psr\Log\LoggerInterface' => 'Psr\Log\LoggerInterface']
     *
     * otherwise:
     *
     *  * ['logger' => '?Psr\Log\LoggerInterface'] denotes an optional dependency
     *  * ['loggers' => '?Psr\Log\LoggerInterface[]'] denotes an optional iterable dependency
     *  * ['?Psr\Log\LoggerInterface'] is a shortcut for
     *  * ['Psr\Log\LoggerInterface' => '?Psr\Log\LoggerInterface']
     *
     * @return string[] The required service types, optionally keyed by service names
     */
    public static function getSubscribedServices(): array;
}

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The Future of Digital Wallets: How Mobile Payments are Shaping the Financial Landscape

Digital wallets have fundamentally transformed how we manage money, offering a streamlined, secure, and highly efficient method for handling payments and transactions. By consolidating credit, debit, and loyalty card information into a single app, digital wallets simplify the payment process and eliminate the need for physical cards, enhancing both convenience and security.
As digital wallets evolve, they are integrating advanced features that push the boundaries of traditional payment methods. Biometric authentication, such as fingerprint and facial recognition, adds an extra layer of security, ensuring that only authorized users can access their payment information. Real-time transaction alerts provide instant notifications for every transaction, allowing users to monitor their spending and detect any unauthorized activity swiftly. Budgeting tools within digital wallets offer personalized insights and financial management capabilities, helping users track their expenses and plan their budgets more effectively.
The growing adoption of digital wallets is fueled by their ease of use and the increasing demand for contactless payment solutions. As technology advances, digital wallets are likely to incorporate even more innovative features, such as artificial intelligence for personalized financial advice, integrated loyalty programs for seamless rewards management, and cross-border transaction capabilities for global shopping convenience.
The integration of these features is reshaping the financial landscape by making transactions not only faster but also more secure and user-friendly. The future of digital wallets is set to further revolutionize how we handle our finances, offering an all-encompassing solution that caters to the evolving needs of modern consumers. As digital wallets continue to advance, they will play an increasingly central role in shaping the future of financial interactions, driving the global shift towards a more digital and cashless economy.

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