McDonald's is giving away free fries to customers using Apple Pay on every Friday in July. Business Insider says consumers will need Apple Pay and the McDonald's mobile app to take advantage of the promotion. The first day of the promotion is Friday, July 12. National French Fry Day is July 11th. Customers who spend at least $1 using Apple Pay on the McDonald's app are eligible to receive a free, medium-sized french fries. The promotion will continue on Friday, July 19 and Friday, July 26.