List the names of all the customers with the same payment method as Devin Mills.
SELECT DISTINCT t1.customer_name FROM customers AS t1 JOIN customer_contact_channels AS t2 ON t1.customer_id   =   t2.customer_id WHERE t1.payment_method  =   ( SELECT DISTINCT t1.payment_method FROM customers AS t1 JOIN customer_contact_channels AS t2 ON t1.customer_id   =   t2.customer_id WHERE t1.customer_name  =  "Devin Mills" ) 
customers with the same payment method = JOIN on customer_id and filter by payment_method; 'as Devin Mills' refers to filtering the dataset where customer_name = 'Devin Mills'; DISTINCT is used to avoid duplicate names.