The marketing data landscape is changing in ways that will disadvantage stores that rely on third-party data and advantage those that have invested in first-party data. Third-party cookies are being deprecated. Platform attribution is degrading. iOS privacy changes have already reduced the accuracy of Meta ad reporting for most stores running Facebook and Instagram ads.
First-party data — information you collect directly from your customers with their consent — is becoming one of the most valuable assets a Shopify store can own.
What Is First-Party Data in Ecommerce?
First-party data is any information you collect directly from your customers: purchase history, email opt-ins, product preferences, on-site behavioural data, survey responses, and any other signal that comes from a direct relationship with an identified customer.
This is different from:
- Second-party data — data you purchase or receive from a partner who collected it directly
- Third-party data — data collected by a third party (like an ad network or data broker) and sold broadly, with no direct relationship to your customers
First-party data is the most accurate, the most privacy-compliant, and the hardest for competitors to replicate. It is also the type of data platforms like Meta are moving toward accepting as the primary signal for audience targeting.
How to Collect More First-Party Data
Email Capture
Email addresses are the foundation of first-party data. Every email capture — opt-in forms, checkout email collection, account creation, exit-intent pop-ups — builds a database that you own regardless of what any ad platform does.
Improve your email capture rate with: relevant offers (discount on first order, early access to new products, valuable content), well-timed pop-ups (exit intent or post-scroll engagement rather than on-load), and multiple touchpoints rather than a single form. Product quizzes are particularly effective — they deliver real value (personalised recommendations) while capturing an email address.
A 3% email capture rate on your traffic versus a 1% rate is the difference between 300 and 100 new subscribers per 10,000 sessions. Compounded over years, that is a substantial asset gap.
Post-Purchase Surveys
A single post-purchase survey question — “How did you hear about us?” — provides attribution data that no analytics tool can reliably capture. It also signals to customers that you care about their experience.
Tools like Enquire Labs or Grapevine integrate with Shopify to add post-purchase survey questions to the order confirmation page. The data collected goes directly into your first-party database and can be used to understand which acquisition channels are driving your highest-value customers — not just the most trackable ones.
Customer Accounts and Profiles
Customers who create accounts generate richer first-party data than guest purchasers — purchase history is linked to a profile, preferences can be explicitly stated, and communication can be personalised at a deeper level.
Incentivising account creation post-purchase (points, exclusive access, streamlined future checkout) increases the proportion of your customer base whose behaviour is trackable and addressable.
How to Use First-Party Data for Marketing
Personalised Email Marketing
Purchase history is the most powerful personalisation signal available. A customer who has bought your protein supplements three times responds very differently to an email than a customer who bought once six months ago. Klaviyo and similar platforms allow you to segment and personalise based on purchase history, engagement recency, and product category affinity — all first-party signals.
Lookalike Audiences on Meta
Uploading your customer list to Meta creates a lookalike audience — Meta finds users who resemble your existing buyers. The richer and more recent your customer data, the more accurate these lookalikes. A customer list built from your highest-LTV customers creates a significantly better lookalike than your entire list averaged across all purchase frequencies.
Meta Conversions API (CAPI)
Server-side event tracking via Meta’s Conversions API sends purchase data directly from your Shopify server to Meta, bypassing browser-level privacy restrictions. This improves Meta’s ability to optimise your campaigns against purchase events — the most important signal for ROAS. Shopify has native CAPI integration through the Meta sales channel app.
In our CRO audits, stores that have not implemented CAPI consistently show degraded Meta attribution and reduced campaign performance compared to those that have. It is one of the highest-ROI technical implementations a Shopify store can make if you run Meta ads.
First-Party Data as Infrastructure
The stores that will outperform their competitors in a cookieless, privacy-constrained advertising environment are the ones who started collecting first-party data before they needed it. Building a rich customer database takes time — it compounds with every opt-in, every purchase, every survey response.
Start now, invest consistently, and treat your customer data as the infrastructure asset it is.
Want to understand the state of your first-party data and identify the highest-leverage ways to improve it? Get a free audit — data strategy is increasingly central to how we approach Shopify growth.
