Ecommerce Customer Data Collection – Getting it Right

First published in 2015, rewritten in 2026 so the advice holds today.

Every e-commerce business eventually needs more than basic web analytics. GA4 tells you what shoppers did on your site, but it won't tell you why they abandoned a basket, what they'd like you to stock, or how they feel about your service. For that, you need to ask people directly, and most people are naturally reluctant to hand over personal information.

The reasons for that reluctance haven't changed since this article was first written, though the legal landscape around them has. Anyone collecting customer data in the UK now has to work within UK GDPR and the Privacy and Electronic Communications Regulations (PECR), both of which set firm rules on consent, transparency and what you can do with the data once you have it. The core advice below still holds, but it now sits inside that legal framework rather than beside it.

Say what you need and why, in plain English

The original point still stands: avoid technical or legal jargon that intimidates or confuses. But under UK GDPR, plain language isn't just good manners, it's a requirement. Privacy notices and consent requests have to be specific, unambiguous and easy to understand, not buried in a long terms and conditions page.

• Say exactly what data you want and why you want it, before you ask for it.
• Separate marketing consent from anything you need for order fulfilment. You cannot bundle the two together.
• Avoid pre-ticked boxes. Consent has to be an active, freely given choice.

Incentives still work, but be careful with conditions

Offering a discount code, loyalty points or a small freebie in return for completing a survey or signing up to a mailing list is still one of the most effective ways to encourage participation, and remains entirely legitimate.

The one thing to watch is making consent to marketing a condition of getting the discount itself. Regulators take a dim view of "consent" that isn't really optional. Keep the transactional discount separate from the marketing opt-in, and let people take the discount without having to sign up for emails if they don't want to.

Explain the benefit to the customer, not just to you

Replace generic lines like "to continually improve our services" with a specific, honest explanation of what's in it for the shopper: better product recommendations, early access to sales, fewer irrelevant emails. People are still far more willing to share data when they understand what they personally get back from it.

This is also where the idea of zero-party data has become useful. Rather than inferring preferences from browsing behaviour, you simply ask customers directly what they want, then use that to personalise their experience. It's a more transparent version of the same principle this article originally described.

Ask open questions, not just tick-boxes

Multiple-choice surveys are quick to analyse but tend to get shallow responses. Open-ended questions, where you genuinely ask for a customer's opinion, often generate far more useful feedback, and people are usually happy to give it once you've shown you're asking sincerely rather than just ticking a compliance box.

Make promises about data use, and keep them

The original advice to promise you won't misuse personal details, and then to honour that promise absolutely, is arguably more important now than it was in 2015. Under UK GDPR you have to state your lawful basis for processing data, tell people how long you'll keep it, and give them a straightforward way to withdraw consent or request deletion at any time.

In practical terms:

1. Only collect data you have a genuine use for.
2. Store it securely and don't share it with third parties beyond what you've disclosed.
3. Make opting out as easy as opting in.
4. Review and delete data you no longer need.

Worth noting too: third-party cookies, once the default way to track shoppers across sites without asking, are increasingly restricted. Google had planned to phase them out of Chrome entirely but in 2024 changed course, instead giving users more direct control over tracking preferences. Either way, the direction of travel is the same: businesses that build a trusted, first-party relationship with customers, where people willingly share data because they trust you with it, are far better placed than those relying on data collected without clear consent.

Takeaway

The fundamentals of asking customers for their data haven't changed: be clear, be honest about why you want it, make it worth their while, and keep whatever promises you make. What's changed is that those good habits are now backed by law rather than just good practice, and getting them right is what earns you the kind of first-party data that's becoming more valuable, not less.