Email & Marketing · Ecommerce email & SMS
Klaviyo
integration & API.
Klaviyo integrations for ecommerce stores that need more than the default Shopify connector.
What is Klaviyo?
Klaviyo in plain English.
Klaviyo is a marketing platform built specifically for ecommerce — combining email, SMS, and customer data into one tool. It's the default for serious Shopify stores and has expanded to support BigCommerce, WooCommerce, and headless setups.
What businesses use it for
Common Klaviyo
use cases.
- 01 Ecommerce email automation (welcome, abandoned cart, browse abandonment, post-purchase)
- 02 SMS marketing alongside email
- 03 Behaviour-based segmentation using purchase and browsing data
- 04 Predictive analytics (lifetime value, churn risk, next order)
- 05 Personalised product recommendations in emails
Why custom?
Beyond the default Klaviyo integrations.
Klaviyo is the standard for serious ecommerce email and SMS. We build Klaviyo integrations for stores beyond Shopify — custom carts, headless setups, and unusual product catalogs — and wire in operational data so your flows fire on real signals.
What we build with Klaviyo
Common Klaviyo integrations.
Custom event tracking via Klaviyo Track API
Profile sync with external CRMs
Headless ecommerce event integration
Custom flow triggers from operational events
How a Klaviyo project usually unfolds
How a Klaviyo project usually unfolds.
- 01
Discovery on the customer journey and the data behind it
A working session with marketing and ecommerce to map the actual customer lifecycle — browse, cart, purchase, post-purchase, lapse — and the data available from the storefront, CRM and operational systems to drive the flows that respond to it.
- 02
Design the event model and identity
Klaviyo Track API events, custom profile properties and identity matching across Shopify, WooCommerce, headless storefronts or a custom cart all agreed up front, so the data driving the flows is the same data the team sees in reporting.
- 03
Build the event pipeline and flows in phases
Highest-value flow first — usually the abandoned-cart or post-purchase sequence — then the lifecycle flows, then the bespoke triggers from operational events. Each phase ships and runs against real customers before the next starts.
- 04
Handover with documentation and a maintenance arrangement
Marketing team training on the new events and flows, a runbook for the integration points and what to check when a send looks wrong, and an agreed ongoing support arrangement as the catalogue and customer base evolve.
Typical investment $10K–$50K depending on scope
Typical timeline 4–10 weeks to first delivery
What you can expect
What a Klaviyo integration usually delivers.
Flows that fire on real customer behaviour
Sequences respond to events from the storefront and operational systems — not just the default Shopify connector — so the marketing reaches customers in the moments that move the needle.
Segmentation built on data the team trusts
Profile properties and custom events line up with how the business actually talks about customers, so segments and reports answer the questions marketing is being asked.
A clean integration for unusual storefronts
Headless storefronts, custom carts and multi-store setups all wired into Klaviyo properly, so the data quality matches what a default Shopify install would give.
Reporting that ties marketing to revenue
Attribution and lifecycle reporting that the leadership team can read without exporting to spreadsheets — and that lines up with what the storefront and finance numbers say.
Commonly paired with
Klaviyo works with the rest of your stack.
How we build
Production-grade.
Not Zapier in a trench coat.
Every Klaviyo integration we ship handles failure properly: idempotent jobs, retry logic, dead-letter queues for unrecoverable cases, and observability so you can see exactly where data is at any moment.
Tested
Real test suite, real edge cases. Not just "it worked once."
Observable
You see what is happening — events logged, errors surfaced.
Maintainable
Documented, version-controlled, handed over properly.
More Email & Marketing
Other email & marketing platforms we connect.
M Mailchimp
Mailchimp integrations that go beyond the default ecommerce connectors.
ConvertKit
ConvertKit integrations for creators and course businesses that need automation depth.
SendGrid
SendGrid integrations for businesses that need transactional email to actually arrive.
Twilio
Twilio integrations for SMS, voice, and customer communications at production scale.
FAQ
Common questions about Klaviyo integration.
Does Klaviyo work with WooCommerce?
Yes — both with the first-party connector and through custom integrations for advanced setups (headless WooCommerce, custom event tracking, multi-store sync).
How does Klaviyo compare to Mailchimp for ecommerce?
Klaviyo is purpose-built for ecommerce — better segmentation, better automation triggers, better revenue attribution. For serious online stores it consistently outperforms Mailchimp on revenue per email.
Related reading
Thinking we’ve published on this kind of work.
The hidden costs of SaaS once your business is established
The per-seat licence is the visible cost. Integration tax, lock-in, configuration drift, and the seat tax at scale are the SaaS costs no one quotes up front.
Red flags to watch for when hiring a development agency
The signals that separate agencies who deliver from agencies who disappear after the deposit. Twelve practical red flags from twenty-plus years of seeing them.
Build vs Buy: A decision framework for custom software
A practical framework for deciding when SaaS is enough, when low-code wins, and when custom software is genuinely the right answer — before you spend a dollar.
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Klaviyo?
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