How to update a table with the result of deleting rows in another table

I am trying to delete orders for a given customer on a given date and add the cost of those orders to credit for the customer.

So far, I came up with this:

```

with data as (
    delete from orders
        where customer_id = <customer id>
    and date = '2020-10-05' returning price
), total as (
    select sum(price) from data
)
update paymentdetail
set temp_credit = temp_credit + (select * from total)
where customer_id = <customer id>

```

which works. but is there a better way to update one table using the result of deleting rows from another table given that I only want the aggregate of the result?