If I buy a refurbished mac, how can I claim the warranty ?

The Apple Support link within these Apple community pages, should give options to find

where to contact Apple about repair/warranty. Articles and support pages are online here.

See "Contact Support" in upper right margin of this page, for example.

With more information, one could enter an official site to determine how to submit for

repair and determine status of repair after its been sent in; also how to arrange repairs.

• Apple Repair and Repair Status Check - Official Apple Support

https://support.apple.com/repair

[While this link ^ offers service details. Within certain regions, also a

"mail-in" service. ~ They could send you 'return parcel box' to ship it.]

One of the main portals to contact Apple repair, and research services; see:

• Mac Repair - Official Apple Support

https://support.apple.com/mac/repair/service

Good luck & happy trails!🌞🎣

If this product is under warranty then you can claim warranty at Apple Service Center