How to call REST API with WebClient

public class ExchangeRateClient {
    private final Logger logger = Logger.getLogger(ExchangeRateClient.class.toString());
    
    
    WebClient webClient = WebClient.create();

    /**
     * Get exchangeRates for code defined
     * @param currencyCode
     * @return
     */
    public ExchangeRateResponse exchangeRateData(String currencyCode) {
        
        String url = "https://v6.exchangerate-api.com/v6/<your-key>/latest/USD";
        return webClient.get()
                .uri(url)
                .retrieve()
                .bodyToMono(ExchangeRateResponse.class)
                .block();

    }

public class ExchangeRateResponse {
    private String result;
    private String documentation;

    @JsonProperty("terms_of_use")
    private String termsOfUse;

    @JsonProperty("time_last_update_unix")
    private String timeLastUpdateUnix;

    @JsonProperty("time_last_update_utc")
    private String timeLastUpdateUtc;

    @JsonProperty("time_next_update_unix")
    private String timeNextUpdateUnix;

    @JsonProperty("time_next_update_utc")
    private String timeNextUpdateUtc;

    @JsonProperty("base_code")
    private String baseCode;

    @JsonProperty("conversion_rates")
    Map<String, BigDecimal> conversionRates = new LinkedCaseInsensitiveMap<>();
    
}