BAD REQUEST PAYPAL and NODEJS

Good morning I have a bad request error in the PayPal SDK this is the json of the payment;

var create_payment_json = {
    intent: "sale",
    payer: {
        payment_method: "paypal"
    },
    redirect_urls: {
        return_url: "http://localhost:3000/success",
        cancel_url: "http://localhost:3000/cancel"
    },
    transactions: [{
        item_list: {
            items: data
        },
        amount: {
            currency: "MXN",
            total: totalString,
        },
        description: "This is the payment description."
    }]
};

the data variable is printed like this with a console log;

the variable that I use for the total is printed with the same data.price format, here it captures;

I really do not know the proper format, so if you could help me with this, it would be great.

The error is number 400 BAD REQUEST, I have tried several ways but all with the same result. Greetings