Today’s MarketingMeta API v27 may add catalog products to new ads by default
Meta released Marketing API and Graph API v27.0 on November 4, 2026. On v27, Meta may turn on Product showcase for new ads when the creative leaves those settings blank, and new eligible Sales ad sets that target specific devices expand to other mobile devices unless the device field is set to 0. The catalog batch endpoint stops on v27 in favor of items_batch, and lookalike requests that still send country or location_spec fail. PPC Land says both defaults reach every API version in around 90 days for the device change.
Our take
Anyone who builds Meta ads through scripts or a buying tool needs a code review this week, not a wait for February. Opt out of Product showcase in the creative spec if you want fixed creatives, and set device to 0 when you truly need one OS. Move catalog syncs off the old batch endpoint before you upgrade, or uploads will break the day you ship v27.
