I’m getting a 400 error when making a request to the Amazon Selling Partner API. I already tried it without the “https://”. I am only getting this error when trying any other endpoint than orders/v0/orders.

const axios = require('axios');
const { locale } = require('moment');
require('dotenv').config({ path: './api.env' });

async function apiCall() {
    try {
        // Step 1: Get the LWA access token
        const tokenResponse = await axios.post(
            'https://api.amazon.com/auth/o2/token',
            new URLSearchParams({
                grant_type: 'refresh_token',
                refresh_token: process.env.REFRESH_TOKEN,
                client_id: process.env.CLIENT_ID,
                client_secret: process.env.SECRET_KEY,
            })
        );
        const accessToken = tokenResponse.data.access_token;
        console.log('Access token:', accessToken);
        // Step 2: Set the SP API endpoint and marketplace ID
        const endpoint = 'https://sellingpartnerapi-eu.amazon.com';
        const marketplaceId = 'A1PA6795UKMFR9';

        // Step 3: Prepare the request parameters
        const requestParams = {
            asins: ['B00V5DG6IQ' , 'B00551Q3CS'],
            MarketplaceId: marketplaceId,
            itemType: 'ASIN',
        };

        // Step 4: Make the API call to get orders
        const ordersResponse = await axios.get(`${endpoint}/products/pricing/v0/price`, {
            params: requestParams,
            headers: {
                'x-amz-access-token': accessToken,
            },
        });

        // Step 5: Return or process the JSON response
        console.log(JSON.stringify(ordersResponse.data, null, 2));
        return ordersResponse.data;
    } catch (error) {
        console.error('Error making API call:', error);
    }
}

module.exports = apiCall;