A Medium fries from McDonald's isn't the most healthy option, but that doesn't make them any less popular and now Apple is offering you Medium fries for free during April. The twist being, you need to use Apple Pay to get them.

Apple wants as many people as possible using Apple Pay to buy things. With that in mind, promotions are run regularly to entice you to try it. These typically involve discounts on brands for sports goods, hotels, sneakers, household goods, or clothing. But for April, you can grab a free Medium fries from McDonald's every Friday, of which there are two remaining.

As MacRumors reports, to qualify for the free fries you need to pay in the McDonald's iOS app using Apple Pay. There are a few more rules to follow, though. The purchase must total at least $1 excluding tax and use the McDonald's Mobile Order & Pay service, which allows you to order and pay with a mobile device before going to pick up your food.

The free fries promotion was sent out by Apple via email and is also advertised on the McDonald's deals page, but clearly the email was sent late or the promotion was simply done too quietly as we are only now hearing about it. Even so, it's sure to be popular because who doesn't enjoy free food? The fact you'll be ordering other food, and a milkshake of course, is just a hurdle to getting the free food, right?

If you do visit a McDonald's in the next couple of weeks and find there are no fries available, this promotion is most likely the reason. And if that does happen, expect McDonald's to be eager to do more Apply Pay-related promotions in future.