Request JSON data from the Alipay+ CDN server

{
  "enabled": true,
  "logos":[
      {
        "logoName": "Alipay+",
        "logoUrl": "https://resource.alipayplus.com/prod/A1112TEST0000000/82c67417922f7c946504b2d9faff39c260539213e5a4effbb561396fccde3498/CASHIER_PAYMENT/USD/defaultregion/P2-WEB-TypeD/alipayplus.png",
        "logoPattern": "P2-WEB-TypeD",
        "logoWidth": "912",
        "logoHeight": "120"
      }
    ],
  "brandName": "Alipay+"
}

{
  "enabled": true,
  "logos":[
      {
        "logoName": "Alipay+",
        "logoUrl": "https://resource.alipayplus.com/prod/A1112TEST0000000/82c67417922f7c946504b2d9faff39c260539213e5a4effbb561396fccde3498/CASHIER_PAYMENT/PHP/defaultregion/P2-WEB-TypeD/alipayplus.png",
        "logoPattern": "P2-WEB-TypeD",
        "logoWidth": "912",
        "logoHeight": "120"
      }
    ],
   "promoNames": [
    "{\"en_US\":\"RM1 Voucher\", \"zh_CN\":\"1元 红包\"}"
  ],
  "brandName": "Alipay+"
}

private static String CDNURL_PREFIX  = "https://resource.alipayplus.com/prod/";
private static String ACQUIRER_ID = "A1112TEST0000000";
private static String MERCHANT_ID = "testMerchant";
private static String PRODUCT_CODE     = "CASHIER_PAYMENT";


//Specify logoPattern to request Alipay+ logo and promotion info
public LogoAndPromotion fetchLogoAndPromotion(String logoPattern, String paymentCurrency) {
    
    LogoAndPromotion result = new LogoAndPromotion();   
    
    // 1. Construct a URL and visit the URL
    String url = CDNURL_PREFIX + 
        String.join("/", ACQUIRER_ID, getSHA256Str(MERCHANT_ID),
                    PRODUCT_CODE, paymentCurrency, "defaultregion", logoPattern, "alipayplus.json");
        
    // 2. Use the GET method to read file 
    // Return an empty string when 404 not found or 500 network error occurs
    String rtnJson = HttpClientGet(url);

    // 3. If no JSON file is found with the URL, this indicates that the Alipay+ payment method is unavailable 
    if (Objects.isNull(rtnJson) || rtnJson.isEmpty()) {
        result.setEnabled(false);
        return result;
    }

    JSONObject document = JSON.parseObject(rtnJson);

    // 4. If the enabled field is false in JSON, this indicates no payment method is available
    if (Objects.isNull(document.getBoolean("enabled")) || !document.getBoolean("enabled")) {
        result.setEnabled(false);
        return result;
    }
    result.setEnabled(true);

    // 5. Parse JSON to obtain logo 
    List<LogoAndPromotion> logos = document.getObject("logos", new TypeReference<List<LogoAndPromotion>>(){});
    
    if(logos.size >0){
        result.setLogoName(logos.get(0).getLogoName());
        result.setLogoPattern(logos.get(0).getLogoPattern());
        result.setLogoWidth(logos.get(0).getLogoWidth());
        result.setLogoHeight(logos.get(0).getLogoHeight());
    }
    //6. Process promotion info
    // Get the promoNames field from JSON
    JSONArray promoNames = document.getJSONArray("promoNames");
    result.setPromoNames(fetchPromotionMap(promoNames);
    return result;
}


private Map<String, String> fetchPromotionMap(JSONObject promoNames) {
    Map<String, String> promoMap = null;
    // If the field exists and is not empty, this indicates that promotion info exists
    if (Objects.nonNull(promoNames) && promoNames.size() > 0) {
        promoMap = new HashMap<>();
        // Parse promotion info to Map objects, where the key indicates the language and the value indicates the promotion campaign name
        JSONObject promos = JSON.parseObject(promoNames.getString(0));
        for (Map.Entry<String, Object> entry : promos.entrySet()) {
            promoMap.put(entry.getKey(), (String) entry.getValue());
        }
    }
    return promoMap;
}    



public class LogoAndPromotion {
    private boolean enabled;
    private String logoName;
    private String logoUrl;
    private String logoPattern;
    private String logoWidth;
    private String logoHeight;
    private Map<String, String> promoNames;
    // Getter and Setter......
}

const CASHIER_PAYMENT = 'CASHIER_PAYMENT';
const DEFAULT_LOGO_PATTERN_PARAMS = 'defaultlogo';
const DEFAULT_USER_REGION_PARAMS = 'defaultregion';
const URL_PREFIX = 'https://resource.alipayplus.com/prod';

const acquirerId = 'A1112TEST0000000';
const merchantId = 'testMerchant';


const inquirePaymentOption = (paymentCurrency, userRegion, logoPattern) => {
  // 1. Construct the CDN URL
  const url = `${URL_PREFIX}/${acquirerId}/${genSHA256(merchantId)}/${CASHIER_PAYMENT}/${paymentCurrency}/${userRegion || DEFAULT_USER_REGION_PARAMS
  }/${logoPattern || DEFAULT_LOGO_PATTERN_PARAMS}/alipayplus.json`;
  // 2. Send request
  return fetch(url).then(async (res) => {
    // 3. Request is successful
    if (res.ok) {
      const data = await res.json();
      return data;
    } else if (String(res.status) === '404') {
      // Exception: No payment option is available
      throw new Error('NO_PAY_OPTIONS')
    } else {
      // Exception: network error
      throw new Error('NETWORK_ERROR');
    }
  }, () => {
    // Exception: network error
    throw new Error('NETWORK_ERROR');
  });
};