Why isn't my API adding items to my cart in my online store?

[rodito]

I have a api-rest for add item from external site to my store in shopify, but not working, error 400, here my code: 

app.post('/cart', async (req, res) => {

let formData = {

'items': [{

'id': 7070227824751,

'quantity': 1

}]

};

const apiUrl = 'https://mystore.myshopify.com/cart/add.js';

const axiosConfig = {

headers: {

'Content-Type': 'application/json',

'X-Shopify-Access-Token': shopifyConfig.accessToken,

'Authorization': `Basic ${Buffer.from(`${shopifyConfig.apiKey}:${shopifyConfig.password}`).toString('base64')}`

},

body: JSON.stringify(formData)

};

try {

const response = await axios.post(apiUrl, axiosConfig);

res.json(response);

const allProducts = response.data.products;

res.json(allProducts);

} catch (error) {

res.status(500).send({ error: 'Internal Server Error' });

}

});

I dont know what is wrong, please any help thanks