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DATA INTELLIGENCE

/

Server-Side Tracking

Conversions that arrive, on every browser.

arrive, on every browser

We are the server-side tracking agency for teams whose reporting quietly stopped matching reality. We move collection off the browser into a container you control, send clean events to the ad platforms and your warehouse, and prove the numbers against your sales system — so bidding on paid search and paid social is fed by data worth optimising on.

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750+ brands
Engineer kneeling beside a server rack tracing a single cable with a torch

THE FOUR LAYERS

Four layers, built in this order.

in this order

Measurement plan, server layer, platform connections, then verification. Skipping straight to the build is the most common way to end up with a faster pipe carrying the same broken events.

Measurement plan

Measurement plan

Container & first-party setup

Container & first-party setup

Platform connections

Platform connections

Verification & monitoring

Verification & monitoring

Decide what counts before moving anything.

Server-side collection is plumbing, and plumbing follows a drawing. We start with the event schema: which actions are worth recording, which are revenue and which are steps toward it, what parameters each carries, how identity is handled, and how consent state travels with the data.

This is also where duplication gets removed. Most accounts we inherit count the same purchase two or three times across analytics, ad platform pixels and a tag manager, then reconcile the difference by hand every month. One schema, one definition per action, agreed with marketing and finance, ends that argument permanently.

The output is a document, not a folder of tags: every signal, its trigger, its parameters, its destinations and its owner, written so a new developer can pick it up in an afternoon.

  • Data schema written and signed off before build
  • Revenue actions separated from micro-steps
  • Duplicate collection identified and removed
  • Identity and consent handling defined per signal

1

definition per action, documented and owned

Your own subdomain, your own container.

Browsers are no longer neutral carriers. Between Safari and Firefox, 34.9% of US browsers already turn off third-party cookies by default, and that behaviour has been in place for years — Safari's tracking prevention since 2020 and Firefox's since 2019. Chrome's reversal removed a deadline, not the problem.

So we deploy a server-side container on your own infrastructure or a managed equivalent, served from a subdomain you control, with the client loading a single lightweight endpoint instead of a stack of third-party scripts. Events are enriched, cleaned and routed server-side, which also takes weight off the page — a side benefit worth having, given Deloitte and Google measured a 0.1-second mobile speed improvement lifting retail conversions 8.4%.

The server layer, the code and the hosting sit in accounts you own, documented and version-controlled, so this is infrastructure rather than a dependency on us.

  • Server container on infrastructure and a subdomain you own
  • One lightweight client endpoint replacing stacked scripts
  • Data enriched, cleaned and routed server-side
  • Configuration version-controlled and documented

34.9%

of US browsers block third-party cookies by default

8.4%

retail conversion lift from a 0.1s mobile speed gain (Deloitte)

Clean events into every destination.

Once collection is trustworthy, the destinations matter. We connect the conversions API on each ad platform, push the same records to analytics and to your warehouse, plus offline and CRM-stage imports so the platforms can optimise toward qualified pipeline instead of raw form fills.

Deduplication is the part that goes wrong most often: the same purchase sent from the browser and the server without a shared event identifier is counted twice, and the resulting inflation gets discovered weeks later in a board pack. We set identifiers explicitly, hash and pass the user parameters each platform actually uses to match, monitor match quality per destination, and improve it deliberately rather than accepting whatever score appears.

Consent is enforced in the server layer, not bolted on afterwards: an record that should not leave never does, whichever destination asked for it.

  • Conversions API connected per platform, deduplicated properly
  • Match-quality parameters passed, monitored and improved
  • Offline and CRM-stage imports feeding bidding
  • Consent enforced in the server layer for every destination

0

double-counted conversions once event identifiers are set

Proof, then alerts when it drifts.

A tracking project that ends at launch is half a project. We reconcile every critical action against the source of truth — your CRM, billing system or order table — and publish the variance rather than describing the setup as complete. If purchases differ from orders, you see by how much and why.

Then we monitor. Alerting covers the failures that are invisible from the inside: a signal that stopped after a deploy, spend running with no conversions, a match-quality score sliding, a feed that silently emptied. Those are the incidents that cost real money, because bidding keeps optimising confidently on data that is no longer arriving.

Each month you get a written review of collection health with what changed and what we recommend next, in language your finance team can read without a glossary.

  • Every critical action reconciled against the sales system
  • Variance published, not hidden behind a green tick
  • Alerting on dead signals, dead spend and falling match quality
  • Monthly written review of collection health

Reconciled

every critical action checked against your source of truth

95-99%

conversion capture server-side vs 60-70% pixel-only (SignalBridge)

42.7%

of internet users run an ad blocker (SignalBridge)

Published

The variance against your sales system is shared, not hidden

Yours

Container, subdomain, code and documentation

We made the difference for those brands

Consumer tech and platforms

B2B software, fintech, insurance

B2B software, fintech, insurance

Apparel and lifestyle

Consumer tech and platforms

Consumer tech and platforms

Healthcare & regulated services

Travel & mobility

Apparel and lifestyle

B2B software, fintech, insurance

B2B software, fintech, insurance

Apparel and lifestyle

Healthcare & regulated services

Consumer tech and platforms

Creative, content, arts & culture

Beauty, personal care & wellness

B2B software, fintech, insurance

Creative, content, arts & culture

Healthcare & regulated services

Beauty, personal care & wellness

Consumer tech and platforms

Home essentials, appliances, kitchen & pet

Food & beverage

B2B software, fintech, insurance

Home essentials, appliances, kitchen & pet

B2B software, fintech, insurance

SMB

Healthcare & regulated services

B2B software, fintech, insurance

B2B software, fintech, insurance

Travel & mobility

B2B software, fintech, insurance

01 — The challenge

The platforms and the sales system stopped agreeing.

Ad platforms report conversions the CRM has never heard of. Analytics shows a third figure. Match quality is amber and nobody knows which parameter is missing. Somewhere in the middle, bidding algorithms are being trained on whatever survived the browser, and the monthly reconciliation has become a two-day job for someone senior.

“Our tags look fine. Our numbers do not.”

The cause is structural, not careless. Safari has blocked third-party cookies by default since 2020 and Firefox since 2019, and 34.9% of US browsers turn them off before a page even loads, on top of consent tooling, tracking prevention and content blockers. Browser-only collection was never going to hold. Moving the critical events server-side, with one agreed schema and proper deduplication, is what turns reporting back into something you can plan a budget on.

02 — Our approach

Plan the events. Own the pipe. Reconcile the numbers.

We write the measurement plan first: every action worth collecting, its trigger, parameters, destinations and owner, with revenue separated from micro-steps and duplicate collection removed. Then we deploy a server container on infrastructure and a subdomain you own, replacing stacked third-party scripts with one lightweight endpoint, and enrich and route data server-side. Destinations come next: each platform's conversions API connected with explicit event identifiers so nothing is counted twice, match-quality parameters passed and monitored, offline and CRM-stage imports feeding bidding, and consent enforced in the server layer rather than trusted downstream. Finally we reconcile every critical action against your sales system, publish the variance, and put alerting on dead events, dead spend and falling match quality. The server layer, code and documentation stay in your ownership.

03 — What we did

Four phases to numbers you can defend.

Audit, build, platform connection and verification run in sequence, with a weekly working session and a written monthly review of collection health.

Weeks 1-2 / Audit

Find every signal and every duplicate

Existing tags, pixels and conversion actions inventoried, duplicates identified, and the schema written and signed off.

Auditing existing collection against the sales system

Weeks 2-4 / Build

Stand up the server layer you own

Server container deployed on your own subdomain and infrastructure, data enriched and routed server-side, configuration in version control.

Building the server layer on your own subdomain

Weeks 4-6 / Connections

Connect destinations without double counting

Conversions APIs wired with explicit event identifiers, match-quality parameters passed, offline and CRM outcomes imported.

Match quality monitored per destination

Ongoing / Verification

Reconcile, alert, review

Critical events reconciled against your source of truth, variance published, and alerting on dead events, dead spend and drift.

Reconciliation and alerting after launch

WHAT YOU GET

Deliverables you keep and can maintain.

keep and can maintain

Built in your own accounts and infrastructure, documented as we go, and handed over in a state your developers can work with.

Measurement plan and event schema icon

Measurement plan and event schema

Every signal, trigger, parameter, destination and owner written down, with revenue events separated from micro-events.

Server container build icon

Server container build

A container on your own subdomain and infrastructure, replacing stacked third-party scripts with one lightweight endpoint.

Conversions API connections icon

Conversions API connections

Each platform connected with explicit event identifiers so browser and server events are never counted twice.

Consent and privacy enforcement icon

Consent and privacy enforcement

Consent state travelling with every record and enforced at the container, so restricted data never leaves in the first place.

Offline and CRM imports icon

Offline and CRM imports

Qualified pipeline and closed revenue pushed back to the platforms so bidding optimises toward outcomes that matter.

Reconciliation and alerting icon

Reconciliation and alerting

Every critical action checked against your sales system, with alerts on dead events, dead spend and falling match quality.

HOW WE WORK

Operating standards, not promises.

Operating standards

Whiteboard diagram of browser, server layer and platform API with arrows
Version-controlled
Every configuration change reviewable and reversible
Consent-first
Restricted data never leaves your server layer
Monitored
Alerts on dead signals, dead spend and match-quality drift
Senior
Named analytics engineers on your account
Shape

B2B

CRM stages and closed revenue pushed back so bidding follows pipeline.

Explore

Local

Calls, bookings and store visits collected per location, not in aggregate.

Explore

eCommerce

Purchase events reconciled to orders, with refunds and returns handled.

Explore

Built on trust. Proven by results.

We partner with SMBs and Fortune 500 companies to deliver more than reach — we bring clarity, execution, and measurable outcomes. Every successful partnership starts with a strong culture fit and a shared drive to grow.

Over 253x 5-star
reviews
TikTokGoogle AdsShopifyWebflowSEMrushMeta

CASE STUDIES

Discover why these market leaders are choosing Web Tonic

Discover our work
Discover our work

Case studies

Website Portfolio

Video Ads

Static Ads

Food Allergy Institute — case study lead image

2026

243 → 1,012 consultations/mo · cost per landing page view −30%

Long Beach, California, United States

Food Allergy Institute

Monthly booked enrollment consultations grew from 243 in January 2026 to 1,012 in September 2026 — 5,836 in nine months — while Meta spend stayed flat at $717,944 (+1.7% year over year). Reach was cut back on purpose — impressions fell 24.2% — while landing page views rose 45.2%.

Discover more

Health & medical

Farrukh Ahmed CPA — case study lead image

2026

position 50 → 17 · +166% desktop map impressions

Mississauga, Ontario

Farrukh Ahmed CPA

A Mississauga accounting practice went from average Google position 50.1 at launch to 17.01, grew organic clicks 55.3% on matched months, and lifted Google Business Profile search impressions 92.7% on mobile and 166.0% on desktop year over year.

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Professional services

Stone Decorative — case study lead image

2026

137 → 1,075 monthly clicks · +85% calls

Quebec, Canada

Stone Decorative

A decorative stone retailer climbed from an average Google position of 30.5 to 11.0 and grew monthly organic clicks from 137 to 1,075 across the recovery window, while tracked calls rose 85.3% year over year on matched months.

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Home services & trades

Univer Phone — case study lead image

2026

+77% tracked calls · position 19.2 → 5.5

Saint-Eustache, Boisbriand and Mont-Royal, Quebec

Univer Phone

A three-store phone repair business moved from an average Google position of 19.2 to 5.5, grew search impressions 32.6% year over year, and took 1,844 tracked calls in twelve months against 1,044 in the twelve before that — a 76.6% increase on matched months.

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Retail & e-commerce

Oever — Event promotion (Google Ads)

2026

1,678,801 impressions · $3.05 CPM

New York City, United States

Oever

A New York stage production went from a cold Google Ads account to 1,678,801 impressions and 2,699 clicks in fourteen days, at a $3.05 CPM and $1.90 per click, with 842,159 of those impressions served inside a five-mile geofence around the venue.

Discover more

Events & venues

Santoy Calgary Painters — SEO

2026

+46% sessions

Calgary, Alberta, Canada

Santoy Calgary Painters

Across twelve matched months, a Calgary painting contractor grew all-channel sessions from 841 to 1,229 and profile direction requests from 473 to 571.

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Home services & trades

Peintres Montréal — SEO

2026

+441% sessions

Montreal and Laval, Quebec, Canada

Peintres Montréal

Across twelve matched months, a Montreal and Laval painting contractor grew all-channel sessions from 529 to 2,862 and new users from 472 to 1,823, with a two-month spike accounting for part of the gain.

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Home services & trades

Prépa PPL — audience launch

2026

0 → 1,575 sessions/month

France

Prépa PPL

A French private pilot licence exam-prep platform went from launch to 2,815 all-channel sessions in four months, reaching 1,575 sessions in July 2026 alone from a zero baseline.

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Education & training

Peinture Marcil — SEO launch

2026

0 → 2,176 sessions

Rive-Nord, Montreal, Quebec, Canada

Peinture Marcil

A Rive-Nord commercial and industrial painting contractor went from no measurable search presence to 2,176 all-channel sessions and 55 organic clicks in its first eight months, with profile website clicks up 72%.

Discover more

Home services & trades

Canado-Nacan Équipements — SEO

2026

36.2 → 25.8 avg position

Quebec, Canada

Canado-Nacan Équipements

Across twelve matched months, an industrial safety equipment supplier improved average Search Console position from 36.2 to 25.8 and grew all-channel sessions 9% to 17,724.

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B2B & SaaS

Benjel — SEO

2026

24.8 → 18.8 avg position

Montreal, Quebec, Canada

Benjel

Across twelve matched months, a Montreal air-quality and asbestos testing consultancy improved average Search Console position from 24.8 to 18.8 and grew impressions 13% to 980,767.

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Professional services

Arboxygène — SEO

2026

25.5 → 18.9 avg position

Montérégie, Quebec, Canada

Arboxygène

Across twelve matched months, a certified Montérégie arborist lifted average Search Console position from 25.5 to 18.9, grew impressions 34% to 858,405 and grew profile website clicks 26%.

Discover more

Home services & trades

Traiteur Tiguidou website homepage

Traiteur Tiguidou

Webflow

Webflow Site

Québec, Canada

Traiteur Tiguidou

Built Traiteur Tiguidou a Webflow site where every mobile catering concept gets its own page, its own colour world and its own reason to be booked.

Discover more

Events & hospitality

Millie & Jones website homepage

Millie & Jones

Shopify

Shopify Store + CRO

Hemel Hempstead, United Kingdom

Millie & Jones

Design, development and ongoing maintenance of a 193-product Shopify store for a family-run UK kids' bed brand, built around guided navigation and reassurance instead of a flat product wall.

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Home, sleep and furniture

MARCOZO website homepage

MARCOZO

Shopify

Shopify Design + Development

Canada

MARCOZO

Design and development of MARCOZO's Shopify store — a men's jewelry brand selling tarnish-resistant pieces through category browsing and campaign lookbooks.

Discover more

Jewelry & eyewear

BloomsyBox website homepage

BloomsyBox

Shopify

Shopify Design + Dev + CRO

United States

BloomsyBox

Design, development and conversion work on BloomsyBox's Shopify store — a farm-direct flower subscription that sells recurring plans and single bouquets from the same catalogue.

Discover more

Flowers & gifting

PetalDriven.com website homepage

PetalDriven.com

Shopify

Shopify Design + Development

Mar Vista, Florida, United States

PetalDriven.com

Design and development of PetalDriven's Shopify store — a farm-direct flower catalogue that serves working florists and first-time DIY wedding buyers from the same inventory.

Discover more

Flowers & gifting

SAINT homepage hero with the buy one get one free offer

SAINT

Shopify

Shopify Dev + CRO + Analytics

Australia

SAINT

Development, conversion work and analytics on SAINT's Shopify store — the fit-over product page, the bundle offer and the landing page that carries the paid traffic.

Discover more

Jewelry & eyewear

Culprit Underwear website homepage

Culprit Underwear

Shopify

Shopify Store + CRO

United States

Culprit Underwear

Site build and conversion work on Culprit Underwear's Shopify store — a loud, print-driven underwear brand where every drop is limited, so the store has to convert on fit confidence and bring the same buyer back for the next print.

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Apparel & fashion

Lyson Duval website homepage

Lyson Duval

WordPress

WordPress Site

Québec, Canada

Lyson Duval

A WordPress site for a Québec mentor and EFT practitioner, built so each programme — the collective sanctuary, the self-paced course, the seasonal event — has its own page and its own argument.

Discover more

Coaching & wellness

WholesaleRoses.com website homepage

WholesaleRoses.com

Shopify

Shopify Design + Development

Miami, Florida, United States

WholesaleRoses.com

Design and development of WholesaleRoses.com on Shopify — a farm-direct bulk rose catalogue built so florists, event planners and DIY buyers can shop the way they actually think.

Discover more

Flowers & gifting

roe Wellness website homepage

roe Wellness

Shopify

Shopify Design + Development

United States

roe Wellness

Designed and built the Roe Wellness Shopify store — a mom-and-baby skincare range merchandised around customer-submitted before/after photography and heavily structured reviews.

Discover more

Skin care & beauty

Centre Dentaire Valiquette website homepage

Centre Dentaire Valiquette

WordPress

WordPress Site

La Petite-Patrie, Montréal, Québec

Centre Dentaire Valiquette

The first website for a family dental clinic that had run on word of mouth in La Petite-Patrie since 1986 — built to feel as calm as the practice itself.

Discover more

Healthcare

Petzyo website homepage

Petzyo

Shopify

Shopify Design + Development

Australia

Petzyo

Design and development on Petzyo's Shopify store: a B Corp certified Australian dog food brand selling dry, raw and treat ranges, plus a subscription box, on nutrition detail rather than cute packaging.

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Supplements and wellness

Oura Health

Health & Medical

InBeat OURA SOW001 D2 UGC Matthew 9x16 — video ad creative

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a78b886157ed9bc2f507c28_out2.mp4

Oura Health

Health & Medical

Track your health more accurately with a sleek smart ring

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a7889cfe1dedd519c829fc4_out.mp4

Oura Health

Health & Medical

Monitor your health effortlessly without changing your lifestyle

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a78b86e14801b4217b47458_out2.mp4

Oura Health

Health & Medical

Consistent daily habits and tracking can help improve your overall health

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a7889ad204f7a9be21fd5ab_out.mp4

Oura Health

Health & Medical

Get more clarity and less pressure with health insights

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a78b85e468d9afc9b9d0882_out2.mp4

Oura Health

Health & Medical

Understand your cycle and work with your body's natural rhythm

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a78b84a3a753f3186f65207_out2.mp4

Oura Health

Health & Medical

InBeat OURA F UGC D 9x16 Jenny — video ad creative

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a78c28aacb83de1fd8e3adc_out2.mp4

Oura Health

Health & Medical

Skip the trial and error with a personalized health wearable

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a78897524cfb409e117db2d_out.mp4

Oura Health

Health & Medical

InBeat OURA F UGC D 9x16 Jenny — video ad creative

https://s3.amazonaws.com/webflow-prod-assets/69dce281d3b49704d8c8cdd0/6a78b8333a753f3186f64e0a_out2.mp4

Oura Health

Health & Medical

A more accurate and comfortable way to track your health

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Oura Health

Health & Medical

InBeat OURA F UGC D 9x16 868gjy6ba — video ad creative

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Oura Health

Health & Medical

Track your health and wellness throughout your daily routine

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Food Allergy Institute

Health & Medical

EN

Access expert allergy treatment from anywhere in the country

Food Allergy Institute

Health & Medical

EN

Overcome food allergies with a proven tolerance program

Food Allergy Institute

Health & Medical

EN

Help your child build lasting tolerance to food allergies

MDF

Automotive

FR

Fast and reliable mobile roadside assistance when you need it

MDF

Automotive

FR

Manage your commercial fleet with zero downtime

MDF

Automotive

FR

Avoid surprise bills with transparent auto repair pricing

MDF

Automotive

FR

Get quality car repairs for ten percent less

MDF

Automotive

FR

Enjoy ten percent off your next car repair

MDF

Automotive

FR

Trust your vehicle with affordable and reliable maintenance

MDF

Automotive

FR

Save ten percent with your trusted local mechanic

MDF

Automotive

FR

Get ten percent off all your auto repairs today

Hopper

Travel & Hospitality

EN

Stop wasting money on overpriced hotel rooms

FAQ

What teams ask us first.

What is server-side tracking, in plain terms?

Instead of a dozen third-party scripts firing in your visitor's browser and each reporting to its own platform, the page sends one record to a server layer you control. That layer enriches, cleans and forwards the record on to analytics, ad platforms and your warehouse. The benefits follow from ownership: you decide what data leaves, consent is enforced in one place, data survives browser restrictions and content blockers, and the page carries less weight. The cost is that it is real engineering rather than a checkbox.

Do we still need this now that Chrome kept third-party cookies?

Yes, because the deadline disappeared and the problem did not. 34.9% of US browsers already block third-party cookies by default between Safari and Firefox, and they have done so since 2020 and 2019 respectively — before you count consent rejection, tracking prevention and app environments. Chrome's reversal changed the timeline for one browser. First-party, server-side collection is the durable answer regardless of which way the browsers move next.

Will this inflate our conversion numbers?

Not if it is built correctly, and this is the question to press any supplier on. The failure mode is sending the same purchase from the browser and the server without a shared event identifier, which double counts and quietly flatters every report downstream. We set identifiers explicitly, test with real transactions, and reconcile against your order or billing table before signing anything off. Numbers usually do rise, because events that were previously lost now arrive — and we show you which of the two is happening.

How does consent work in a server-side setup?

Better than in the browser, because enforcement happens in one place you control rather than in each vendor's script. Consent state travels with the signal, and the server layer decides what may be forwarded to which destination; anything that should not leave never leaves. That gives you a single auditable point for GDPR and CPRA questions, and it means a change in policy is one configuration change rather than a hunt through tags. We build to your legal team's requirements and document the logic for them.

Who hosts this, and what does it cost to run?

Either you host it on your own cloud project, which we recommend and set up, or you use a managed provider, which is faster to start and fine for lower volumes. Running costs scale with traffic and are usually modest relative to media spend; for most mid-market sites this is a small monthly cloud bill. We size it honestly up front, including the case where a managed option is the sensible answer, and we would rather quote a realistic figure than a comfortable one.

What does this do to page speed?

It usually helps, because you remove several third-party scripts from the page and replace them with one lightweight call. That matters commercially: Deloitte Digital and Google measured a 0.1-second mobile improvement lifting retail conversions 8.4% and average order value 9.2%. We measure your Core Web Vitals before and after so the change is documented rather than assumed, and we keep the client footprint deliberately small instead of recreating the old script stack inside it.

Can our developers maintain it after handover?

That is the intention, and it is why we keep the build conventional rather than clever. The configuration is version-controlled, the event schema is documented with owners, and the runbook covers the routine changes: adding a signal, adding a destination, rotating credentials, responding to an alert. We also train your team during the build rather than at the end of it. Plenty of clients keep us for monitoring and reviews afterwards, and plenty run it themselves — both are fine outcomes.

How does this improve ad performance rather than just reporting?

Because bidding is only as good as the events it learns from. When conversions arrive reliably, with high match quality and qualified pipeline pushed back from your CRM, the platforms optimise toward customers instead of whatever the browser happened to record. That typically shows up as steadier performance and less erratic learning after changes. Our paid search and analytics teams work from the same layer, so the improvement is used rather than merely observed.

What if our checkout is on a platform we cannot easily change?

Common, and workable. On hosted commerce platforms we use the available server-side hooks, webhooks and order APIs to collect the authoritative purchase event from the backend rather than the page, which is often more reliable than a themed checkout script anyway. Where a platform genuinely blocks something, we say so plainly and design around it rather than promising a workaround that will break at the next update. Our Shopify team handles that case regularly.

How do you prove it worked?

By reconciliation, not assertion. We compare each critical action with your order, billing or CRM records and publish the variance, before and after. We report match quality per destination, the share of conversions arriving server-side, and any gap we could not close along with the reason. Then alerting keeps it honest over time, because the real risk is not a bad launch but a silent break three months later that nobody notices while bidding keeps spending.

Want to know how many conversions never arrive?