How to integrate CHAT GPT with Salesforce

ChatGPTClass.java

global without sharing class ChatGPTClass {
    
    // ChatGPTClass.generateResponse('Hello');

    @AuraEnabled
    public static String generateResponseFromGPT(String queryText){
        try {
            String content = generateResponse(queryText);
            return content;
        } catch (Exception e) {
            throw new AuraHandledException(e.getMessage());
        }
    }

    public static String generateResponse(String queryText){
        HttpRequest httpReq = new HttpRequest();
        httpReq.setEndpoint('https://api.openai.com/v1/chat/completions');
        httpReq.setMethod('POST');
        httpReq.setHeader('Content-Type','application/json');
        httpReq.setHeader('Authorization', 'Bearer <YOUR_API_KEY_HERE>');

        String body = '{'+
		'    "model": "gpt-3.5-turbo",'+
		'    "messages": ['+
		'        {'+
		'            "role": "user",'+
		'            "content": "'+queryText+'"'+
		'        }'+
		'    ]'+
		'}';

        httpReq.setBody(body);

        Http http = new Http();
        HttpResponse httpResponse = http.send(httpReq);
        String content = '';
        if(httpResponse.getStatusCode() == 200){
            System.debug(httpResponse.getBody());
            ChatWrapper wrapper = (ChatWrapper)System.JSON.deserialize(httpResponse.getBody(), ChatWrapper.class);
            List<ChatGPTClass.Choices> choices = wrapper.choices;
            if(choices != null && choices.size() > 0){
                ChatGPTClass.Choices choice = choices.get(0);
                if(choice.message != null){
                    content = choice.message.content;
                    System.debug(content);
                }
            }
        }else{
            System.debug('Error Occured !');
            System.debug(httpResponse.getBody());
        }
        return content;
    }

    global class ChatWrapper{
        public String id;
        public Choices[] choices;
    }
    global class Choices {
        public Message message;
        public String finish_reason;
        public Integer index;
    }
    global class Message {
        public String role;
        public String content;	//there! How can I assist you today?
    }
}