I tried to integrate ChatGPT with a free-tier account, but I always receive the following error:
 

{“error”:{“message”:”You exceeded your current quota, please check your plan and billing details. For more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors.”,”type”:”insufficient_quota”,”code”:”insufficient_quota”}}

           HttpPost httpPost = new HttpPost("https://api.openai.com/v1/completions");

            // Set headers
            httpPost.setHeader("Content-Type", "application/json");
            httpPost.setHeader("Authorization", "Bearer " + openaiApiKey);

            // Create JSON payload
            JsonObject json = new JsonObject();
            json.addProperty("model", "gpt-3.5-turbo");
            json.addProperty("prompt", prompt);
            json.addProperty("max_tokens", 100);

            StringEntity entity = new StringEntity(json.toString());
            httpPost.setEntity(entity);

            // Execute the request
            try (CloseableHttpResponse response = httpClient.execute(httpPost)) {
                String responseString = EntityUtils.toString(response.getEntity());
                JsonObject responseJson = JsonParser.parseString(responseString).getAsJsonObject();
                return responseJson.getAsJsonArray("choices").get(0).getAsJsonObject().get("text").getAsString().trim();
            }

Error found:

{“error”:{“message”:”You exceeded your current quota, please check your plan and billing details. For more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors.”,”type”:”insufficient_quota”,”code”:”insufficient_quota”}}
 
Does this mean that a free-tier account cannot be used for testing, and I need to upgrade to a paid plan to increase the limit for testing?