Grokking Spring Boot
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Externalized Configuration

This is the constructor of PaymentClient, the class in the booking service that calls the payment provider:

@Component
public class PaymentClient {

    private static final Logger log = LoggerFactory.getLogger(PaymentClient.class);

    private final String baseUrl;
    private final Duration timeout;

    public PaymentClient(
            @Value("${booking.payments.base-url}") String baseUrl,
            @Value("${booking.payments.timeout:2s}") Duration timeout) {
        this.baseUrl = baseUrl;
        this.timeout = timeout;
        log

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