Google Ads in the Agentic Era: Merchant Center Becomes the Center

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Great article in Search Engine Journal surrounding the shift in Google Ads: the product feed is no longer just a catalog. It’s becoming THE primary bidding signal.

This shift matters for payments strategists because it reveals how Google is positioning itself as the orchestration layer for agentic commerce. The advertising infrastructure and the commerce infrastructure are converging, and Merchant Center is the “last mile” integration point to merchant data from store level product inventory, to pricing, to SKU level purchase feeds (for measurement).

From Catalog to Bidding Signal

In Google’s Ad model, the product feed was hygiene (a checkbox to enable Shopping campaigns). Creative, bid strategies, and audience targeting were the areas media buyers focused on. The feed was someone else’s problem. That model is inverting. When an AI agent evaluates products on behalf of a consumer, it doesn’t read your ad copy or see your creative. It reads structured data: price, availability, shipping, returns, specifications. The agent decides whether you make the shortlist before a human sees anything.

Google has noticed where the lever sits. New Merchant Center attributes released this year are specifically designed to help products surface in conversational shopping. Feed quality is now a bidding issue, not a hygiene issue.

This echoes what I wrote in January when Google unveiled UCP at NRF: the strategic imperative is no longer about organizing information but about organizing commercial intent. Merchant Center is where merchant capabilities are registered for scoring against consumer intent.

The Direct Offers Experiment

The shift is exemplified with new “tests” like Direct Offers (an outgrowth of Offer Ad Extensions and Coupons), a Google Ads pilot that drops merchant-funded promotions directly into AI Mode when the system reads high purchase intent. You set the offers in your campaign settings; Google decides when to surface them. Think about what this means for a media buyer: you’re no longer only bidding for a placement. You’re deciding how much margin you’ll give up at the exact moment of decision, inside an interface Google controls.

Google has signaled it will expand Direct Offers beyond price to include loyalty benefits and product bundles. I’m suspect on this one as this is at least the 4th iteration of this product. However, brands that build a non-price offer strategy now get to compete on something other than margin erosion.

Performance Max Meets AI Mode

Here’s the development that makes this tangible for anyone running Performance Max: as of February 2026, Google began serving shopping ads inside AI Mode, drawn from your existing Shopping and PMax campaigns.

Your workhorse campaigns are already feeding the agent-mediated surface whether or not you planned for it. The catch is visibility: more of the journey happens where you see less of what’s going on.

The good news is Google restored meaningful controls over the past year: channel-level reporting, campaign-level negatives, improved search terms visibility. Use them. The gap between what you bid on and what converts is widening.

Why Merchant Center Becomes the MCP/UCP Interface

This is where the strategic implications get interesting. Google isn’t just updating its ad products—it’s positioning Merchant Center as the universal interface for merchants participating in agentic commerce. Consider what Merchant Center already aggregates:

  • Product catalog with structured attributes (the traditional function)
  • Inventory feeds with real-time availability by location
  • Pricing and promotions including dynamic offers
  • Fulfillment data including shipping speeds and return policies
  • Business identity including reviews, ratings, and trust signals

With UCP, this becomes the surface where agents discover, negotiate, and transact. A merchant updating their Merchant Center feed is simultaneously:

  1. Updating their advertising campaigns
  2. Publishing to AI shopping surfaces
  3. Making inventory available to autonomous agents
  4. Enabling conversational commerce through Gemini

This is the virtuous cycle I described in January—data sharing equals sales. But now the mechanism is explicit. Merchant Center becomes the MCP-like interface (in the agentic sense) where merchants maintain a single source of truth that propagates across all Google commerce surfaces.

The Local Inventory Opportunity

The implications for small and local merchants could be transformative. In a previous blog, I described how this works with a simple example: when you search for “outdoor furniture,” Google Local shows “in stock at Crate and Barrel” with directions. Data sharing equals sales.

Now extend this to agentic commerce. An AI shopping agent with access to real-time local inventory could:

  • Find the exact SKU you need at a store 10 minutes away
  • Confirm it’s actually in stock (not “online inventory says maybe”)
  • Arrange immediate pickup or rapid local delivery
  • Handle the purchase on your behalf

This transforms isolated small merchants into interconnected nodes within a responsive local supply network, all orchestrated through Merchant Center. The challenge has always been data maintenance. Small merchants can’t afford to manually update inventory feeds. But AI systems can learn sales velocities and proactively prompt updates (“It appears you may be running low on Product X”). Integration with POS systems like Square or Clover could automate the entire flow.

If accomplished, Google’s visibility across distributed local inventory unlocks hyperlocal fulfillment that Amazon can’t match. Amazon has warehouses; Google could have every store.

The Attribution Reckoning

There’s a catch, and it’s significant: agentic checkout breaks attribution in ways that depend on how the agent completes the purchase.

Path 1: Buy for Me — The agent completes the purchase on the merchant site; you stay merchant of record. Your conversion tag can fire, but the link back to the campaign is broken because the agent session doesn’t carry an ad click through to checkout. You keep the conversion but lose the attribution.

Path 2: UCP Checkout — The purchase happens directly on Google’s surface inside AI Mode. You’re still merchant of record, but the sale never happens in a browser session on your domain. Your client-side tracking goes blind. You lean on conversion data from Merchant Center instead.

The second path is particularly challenging because it’s not just Google’s analytics that loses visibility, it’s every platform tag. Meta, TikTok, the retargeting vendors—none of them see the event. This accelerates a trend I’ve been writing about: the shift from platform-attributed ROAS to blended efficiency metrics and incrementality testing. In-platform numbers will tell you less of the truth than they used to.

What This Means for the Industry

Several implications emerge:

For Merchants: Merchant Center moves from a technical setup task to a strategic asset. The completeness, accuracy, and freshness of your product data directly impacts your competitiveness in agentic surfaces. This is media planning now, not IT.

For Google: This cements their position as the commerce orchestration layer. While OpenAI, Perplexity, and others build agent experiences, Google controls the product data infrastructure those agents need. UCP isn’t just a protocol—it’s a moat.

For Small Business: The barrier to agentic commerce participation drops dramatically if Merchant Center becomes the universal interface. You don’t need to implement multiple protocols or maintain separate agent endpoints. You update your feed; Google handles distribution.

For the Advertising Industry: The skills that matter are shifting. Feed management, structured data optimization, and inventory accuracy become as important as bid strategy and creative testing. The agencies and platforms that adapt will thrive.

The Playbook

For those managing Google campaigns today, the priorities are clear:

  1. Treat your product feed as a media asset. Fill every attribute field, keep it accurate, refresh it frequently. This is where you win or lose inclusion.
  2. Make constraint fields machine-readable. Price, shipping, returns, availability—these are what agents evaluate first.
  3. Decide your Direct Offers posture before opting in. Which products, what margin floor, lead with price or value?
  4. Shore up measurement now. Server-side tracking, enhanced conversions for capture; incrementality and blended metrics for truth.
  5. Enable local inventory feeds if you have stores. The hyperlocal opportunity is real and underexploited.
  6. Don’t abandon what works. This is additive. The vast majority of revenue still flows through traditional campaigns. But the accounts that adjust early get a real edge.

The Bigger Picture

I keep returning to the same theme across these agentic commerce posts: the interface is disappearing, but the infrastructure is solidifying. The consumer won’t see Merchant Center any more than they see the card network rails behind Apple Pay. But those rails determine who can participate and on what terms. Google appears to understand that the future of commerce isn’t about building the best shopping agent—it’s about building the infrastructure that every shopping agent needs. Merchant Center, enhanced with UCP, is that infrastructure.

The advertisers who win agentic commerce won’t be the ones with the cleverest ads. They’ll be the ones whose product data, margin posture, and measurement are ready for a buyer who never sees the ad. The agent is becoming the customer you optimize for. It judges you on inputs most accounts still treat as an afterthought.

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