SQL Union & join

Question

I know there are a lot of topics about sql union/join but this is a special case because I would like to compare the expenses of each customer in two different stores. I'm using the "Sakila" sample database

SELECT customer.last_name AS prenom,
       sum(payment.amount) AS total_payé
FROM payment
INNER JOIN customer ON payment.customer_id = customer.customer_id
WHERE store_id = 1
LIMIT 3
UNION ALL
SELECT customer.last_name AS prenom,
       sum(payment.amount) AS total_payé
FROM payment
INNER JOIN customer ON payment.customer_id = customer.customer_id
WHERE store_id = 2
LIMIT 3

but have a error, i need help :(