{
   "Response":{
      "RequestId":"f796c81b-d0c6-4cf7-b0fa-4d9194ecad10",
      "Spans":"Base64EncodedString",
      "TotalCount":11151
   }
}

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.zip.GZIPInputStream;

public class OtApiDecoder {
    public static String decodeSpans(String spans) {
        Base64.Decoder base64Decoder = Base64.getDecoder();
        byte[] bytes = base64Decoder.decode(spans);
        try (ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
             GZIPInputStream gis = new GZIPInputStream(bais);
             ByteArrayOutputStream baos = new ByteArrayOutputStream();) {
            byte[] buffer = new byte[1024];
            int bytesRead = 0;
            while ((bytesRead = gis.read(buffer)) != -1) {
                baos.write(buffer, 0, bytesRead);
            }
            bytes = baos.toByteArray();
            String result = new String(bytes, StandardCharsets.UTF_8);
            return result;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

{
   "resourceSpans":[
      {
         "resource":{
            "attributes":[
               {
                  "key":"service.name",
                  "value":{
                     "stringValue":"java-order-service"
                  }
               }
            ]
         },
         "scopeSpans":[
            {
               "scope":{
                  "name":"apm/traces/spans",
                  "version":"v1.0"
               },
               "spans":[
                  {
                     "traceId":"9bda979bfbf9f27f94232909dc2a0a68",
                     "spanId":"e2f379eb4405dcb5",
                     "parentSpanId":"",
                     "name":"GET /slowSql",
                     "kind":2,
                     "startTimeUnixNano":"1741082699964148",
                     "endTimeUnixNano":"1741082703966151",
                     "attributes":[
                        {
                           "key":"key1",
                           "value":{
                              "stringValue":"value1"
                           }
                        },
                        {
                           "key":"key2",
                           "value":{
                              "stringValue":"value2"
                           }
                        }
                     ],
                     "status":{
                        "code":0
                     }
                  }
               ]
            }
         ]
      }
   ]
}