Having issues implementing ChatGPT API Key into Chatbot on Wix Site

Question:
I’m having issues over & over again trying to implement a chatbot on my Wix Studio site. The code I’m entering for backend (chatbot.jsw) is:

import { fetch } from 'wix-fetch';
import { secrets } from 'wix-secrets-backend';

export async function getOpenAIResponse(userMessage) {
    try {
        const apiKey = await secrets.get("OpenAI_API_Key"); // Retrieve the API key securely
        if (!apiKey) {
            throw new Error("API Key is missing or not set up in Wix Secrets Manager.");
        }

        const response = await fetch("https://api.openai.com/v1/chat/completions", {
            method: "POST",
            headers: {
                "Content-Type": "application/json",
                "Authorization": `Bearer ${apiKey}`
            },
            body: JSON.stringify({
                model: "gpt-3.5-turbo",
                messages: [{ role: "user", content: userMessage }],
                max_tokens: 100
            })
        });

        if (!response.ok) {
            const errorText = await response.text();
            throw new Error(`OpenAI API Error: ${response.status} - ${errorText}`);
        }

        const data = await response.json();
        return data.choices[0].message.content; // Return AI response
    } catch (error) {
        console.error("OpenAI API Error:", error);
        return "Sorry, something went wrong.";
    }
}

Then for the frontend:

import { getOpenAIResponse } from 'backend/chatbot';

$w.onReady(function () {
    $w('#sendButton').onClick(async () => {
        const userMessage = $w('#chatInput').value.trim();
        
        if (!userMessage) {
            $w('#aiResponseText').text = "Please enter a message.";
            return;
        }

        $w('#aiResponseText').text = "Thinking..."; // Show loading message
        
        try {
            const aiResponse = await getOpenAIResponse(userMessage);
            $w('#aiResponseText').text = aiResponse;
        } catch (error) {
            console.error("Chatbot error:", error);
            $w('#aiResponseText').text = "Sorry, something went wrong.";
        }
    });
});

Please, what am I doing wrong!?! I’ve tried over and over. The error message I’m continuing to get is:

OpenAI API Error: Cannot read properties of undefined (reading ‘get’)

I’ve checked, double-checked and triple-checked everything but continuously running into issues! Any help would be much appreciated!

Product:
Wix Studio

What are you trying to achieve:
I’m trying to create a chatbot which can answer questions for guests relating to Airbnb properties they are staying in.

What have you already tried:
I have tried making a text input for questions, submit button & text box for answers with API key.

Change POST to post - it’s likely defaulting to a GET due to this.