# Meta's Marketing API v27 turns on two settings by default in new ads

> Ads built through Meta's Marketing API v27 may show catalog products and reach more devices by default from 4 November 2026. Who it affects and the opt-outs.
- **Author**: Marxx
- **Published**: 2026-11-05
- **Category**: Meta
- **URL**: https://marxx.ai/library-news/meta-marketing-api-v27-new-ad-defaults

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Meta released version 27 of its Marketing API on **4 November 2026**, and new ads built through it may show catalog products and reach more devices by default. This matters if a tool, agency script or platform creates your Meta ads for you rather than you clicking through Ads Manager.

## What we know

[PPC Land reported](https://ppc.land/metas-api-v27-may-add-catalog-products-to-new-ads-by-default/) the release on 4 November 2026, citing Meta's developer blog. We could not open Meta's own changelog on the day, so treat these details as reported.

| Change | When | Opt-out |
|---|---|---|
| Product showcase may be added to new ads with no setting | API v27 from 4 Nov 2026 | Set product showcase to opt out |
| Sales ad sets that target certain devices may reach other devices | API v27 now, all versions about 90 days later | Set the device setting to 0 |
| Lookalike audiences reject country and location fields | API v27 now, all versions about 90 days later | None. Location comes from the ad set |

- **Reported, citing Meta:** Meta adds product showcase only when it has "high confidence" in a matching product set.
- **Reported, citing Meta:** the device default skips Special Ad Categories and app-install ad sets, and leaves existing ad sets alone.
- **Not answered:** whether Ads Manager gets the same defaults.

## What it means for your ad account

If your ads come from a tool that moves to API v27, new ads may show products from your catalog under the creative, even for a brand ad. A Sales campaign aimed only at iPhone users may start showing on Android too. Neither change touches ads already running.

## What to do this week

1. **Ask your tool or agency** which Marketing API version it uses and when it moves to v27.
2. **Check new ads** built after 4 November 2026 for product showcase in the preview.
3. **Check device-targeted Sales ad sets** made after that date for delivery on other devices.
4. **Read up on catalog ads** in our [Advantage+ catalog ads guide](/glossary/advantage-plus-catalog-ads) and when automation helps in [Advantage+ vs manual campaigns](/compare/advantage-plus-vs-manual-campaigns).

## FAQ

### Do ads I make in Ads Manager change?

Meta has not said. The reported changes cover ads created through the Marketing API.

### Will my running ads change?

No. Meta says existing ad sets keep their settings.

### What is product showcase?

It shows products from your catalog alongside an ad. Meta's API calls it product extensions.

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