如何接收viber REST API回调(使用java、spring)？

import com.viber.bot.api.ViberSignatureValidator;
import com.viber.bot.event.incoming.IncomingConversationStartedEvent;
import com.viber.bot.event.incoming.IncomingMessageEvent;
import com.viber.bot.event.incoming.IncomingSubscribedEvent;
import com.viber.bot.event.incoming.IncomingUnsubscribedEvent;
import com.viber.bot.event.incoming.IncomingWebhookEvent;
import com.viber.bot.message.Message;
import com.viber.bot.message.TextMessage;
import com.viber.bot.profile.BotProfile;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ViberWebhookController {

    private final ViberSignatureValidator signatureValidator;
    private final BotProfile botProfile;

    @Autowired
    public ViberWebhookController(ViberSignatureValidator signatureValidator, BotProfile botProfile) {
        this.signatureValidator = signatureValidator;
        this.botProfile = botProfile;
    }

    @PostMapping("/viber/webhook")
    public ResponseEntity<String> handleWebhook(
            @RequestHeader("X-Viber-Content-Signature") String signature,
            @RequestBody String requestBody) {

        if (!signatureValidator.isSignatureValid(signature, requestBody)) {
            return ResponseEntity.status(HttpStatus.UNAUTHORIZED).build();
        }

        IncomingWebhookEvent event = botProfile.getEvent(requestBody);

        if (event instanceof IncomingMessageEvent) {
            handleIncomingMessage((IncomingMessageEvent) event);
        } else if (event instanceof IncomingConversationStartedEvent) {
            handleConversationStarted((IncomingConversationStartedEvent) event);
        } else if (event instanceof IncomingSubscribedEvent) {
            handleSubscribed((IncomingSubscribedEvent) event);
        } else if (event instanceof IncomingUnsubscribedEvent) {
            handleUnsubscribed((IncomingUnsubscribedEvent) event);
        }

        return ResponseEntity.ok("Received");
    }

    private void handleIncomingMessage(IncomingMessageEvent event) {
        Message message = event.getMessage();
        // 处理收到的消息
    }

    private void handleConversationStarted(IncomingConversationStartedEvent event) {
        // 处理会话开始事件
    }

    private void handleSubscribed(IncomingSubscribedEvent event) {
        // 处理用户订阅事件
    }

    private void handleUnsubscribed(IncomingUnsubscribedEvent event) {
        // 处理用户取消订阅事件
    }
}

viber-bot.api-key=YOUR_API_KEY
viber-bot.webhook-url=https://your-domain.com/viber/webhook
viber-bot.webhook-event-types=conversation_started,subscribed,unsubscribed,message