This guide covers the specific skills and capabilities an ecommerce PPC agency needs: Shopping feed expertise, ROAS-based bidding, Performance Max management, cross-platform attribution, creative testing, and platform-specific knowledge.
1. Shopping Feed Expertise Is Non-Negotiable
If an ecommerce PPC agency does not talk about your product feed within the first 15 minutes of a pitch call, that tells you something. The feed is the foundation of Shopping campaigns, Performance Max campaigns, and dynamic remarketing. Everything builds on top of it.
A good ecommerce agency will want to audit your feed before they even propose a strategy. They will look at your product titles (are they keyword-rich or just brand names?), your descriptions (are they detailed enough?), your GTINs (are they filled in?), and your product categories (are they mapped correctly to Google's taxonomy?).
Feed management is not glamorous work, but it is the single highest-ROI activity in ecommerce PPC. Stores with well-structured feeds consistently see 15-30% lower CPCs on the same products. If your agency treats the feed as an afterthought, your campaigns will underperform.
2. ROAS-Based Bidding and Margin Awareness
Here is where ecommerce agencies diverge from lead gen agencies. In lead gen, the primary metric is cost per acquisition. In ecommerce, the primary metric is return on ad spend, and ROAS targets need to reflect your actual margins.
A good ecommerce agency will ask about your margins on day one. Not just your average margin, but your margin by product category. Because a $10 accessory with 80% margin and a $500 product with 20% margin need completely different ROAS targets to be profitable.
They should also segment campaigns by margin tier. High-margin products can afford lower ROAS targets and more aggressive bidding. Low-margin products need tighter controls. An agency that applies the same ROAS target across your entire catalog is leaving money on the table (or burning it).
3. Performance Max Is Not Optional
Performance Max has become the default campaign type for ecommerce. If your agency still avoids PMax or cannot articulate a clear PMax strategy, they are behind. That said, PMax is not magic. It requires active management, proper asset group segmentation, and ongoing monitoring to perform well.
Ask any prospective agency how they structure PMax campaigns for ecommerce. A good answer involves segmenting asset groups by product category or margin tier, using custom audience signals, excluding non-commercial URLs, and regularly reviewing the insights tab to understand where impressions are going.
A bad answer: "We set up PMax with your product feed and let Google's AI do the work." That is not management. That is abdication.
4. Cross-Platform Attribution
Most ecommerce brands run ads on Google and Meta at minimum. The challenge is figuring out how these channels interact. A customer might see a Meta ad, click a Google Shopping ad two days later, and convert. Both platforms claim the sale.
A good ecommerce agency understands attribution modeling and does not just report platform numbers at face value. They should be comparing platform-reported data with your actual Shopify (or store platform) revenue, looking at new vs returning customer metrics, and building a blended view that accounts for cross-platform overlap.
If your agency reports Google ROAS and Meta ROAS separately without ever discussing how the two interact, they are giving you a distorted picture.
5. Creative Testing for Ecommerce
Ecommerce creative is different from B2B creative. Your ads need to show products, prices, promotions, and social proof in formats that work across Shopping, Display, YouTube, and Meta. An ecommerce agency should have a testing framework for ad creative and should be able to show you examples of tests they have run.
Look for agencies that test product imagery (lifestyle vs white background vs UGC), ad copy (benefit-focused vs price-focused vs urgency-based), and format (single image vs carousel vs video). Testing one element at a time with clear success metrics.
6. Platform-Specific Knowledge
If your store runs on Shopify, your agency needs to know Shopify. Same for WooCommerce, BigCommerce, or Magento. Platform-specific knowledge affects everything from conversion tracking setup to feed management to landing page optimization.
For Shopify specifically, your agency should know how the Google channel app works (and its limitations), how to handle Shopify's checkout domain for conversion tracking, and how to structure product URLs for optimal ad performance. Our Shopify Google Ads audit guide covers the most common platform-specific issues.
An agency that has never worked with your platform can still manage your ads. But they will have a learning curve, and that learning curve costs you time and money. Ask how many clients they manage on your specific platform.
7. Questions to Ask Before Signing
Here is a condensed checklist for evaluating an ecommerce PPC agency. Use these during your discovery calls:
- "How do you approach Shopping feed management?" (They should have a specific process.)
- "How do you set ROAS targets for different product categories?" (They should ask about your margins.)
- "Walk me through your PMax structure for a store with 500+ SKUs." (They should segment by category or margin.)
- "How do you handle attribution across Google and Meta?" (They should have a blended reporting approach.)
- "How many ecommerce clients do you manage on my platform?" (Specific number, not "several.")
- "What does your first 30 days look like?" (Audit, feed review, tracking verification, restructuring plan.)
For a deeper list of questions, check our guide on how to choose a Google Ads agency.
Frequently Asked Questions
An ecommerce-specific agency will get you results faster because they already understand Shopping feeds, ROAS bidding, product segmentation, and platform-specific attribution. A general agency can learn these things, but you are paying for their learning curve. If ecommerce is your core business, go with a specialist.
It depends entirely on your margins. A store with 70% margins can be profitable at 2x ROAS. A store with 30% margins needs 4x or higher. A good agency will ask about your margins on day one and set ROAS targets based on your actual unit economics, not industry averages.
If they are genuinely strong at both, yes. Cross-platform management allows better budget allocation and reduces the chance of duplicate attribution. But make sure they have real Meta expertise and are not just running basic retargeting alongside their Google work.
Very. Your Shopping feed directly affects which searches trigger your products, your CPCs, and your conversion rates. An agency that treats the feed as an afterthought will struggle to deliver strong Shopping and Performance Max results. Feed management should be a core part of their service.
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