DATA DISCREPANCY ANALYSIS · データ差異分析

Three Ad Platforms. Three Conversion Counts. None of Them Match.

In Japan, Google Ads, Yahoo Japan Ads, and Meta each report conversions independently — with no shared attribution logic and no unified view. Add phone conversion data sitting in a CRM or call centre that is completely disconnected from all three platforms, and the gap between reported performance and actual business outcomes is typically larger than anyone has formally acknowledged.

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/ This is for you if

Who this is for

International brands managing Japan campaigns from a regional or global headquarters: You receive reporting from Google Ads, Yahoo Japan Ads, and Meta for your Japan market. The three reports are produced separately, use different attribution settings, and cannot be combined into a single coherent view. You are not confident the numbers are comparable, and you have no basis for deciding how to allocate budget between the three platforms. You need an independent analysis that maps the gaps and produces a reconciliation methodology you can apply to Japan reporting consistently.

Japan-based businesses with significant phone or call centre enquiry volume: A meaningful share of your customer enquiries arrive by phone — either through call centre operations, direct calls from ads, or calls initiated after a web visit. This phone conversion data sits in your CRM or call centre system, completely disconnected from your ad platforms. Your Google Ads, Yahoo Japan Ads, and Meta accounts are each optimising without any visibility of phone-originated conversions. The result is a systematic misallocation of budget toward campaigns that capture web form conversions while campaigns driving phone enquiries are undervalued.

Growth and analytics teams at Japan-based or Japan-operating companies: You are responsible for paid acquisition reporting and you are aware that the numbers from different platforms do not agree, but you have not had the time or methodology to investigate the cause systematically. You need a structured audit that maps every discrepancy across your Japan measurement stack, identifies the root cause of each gap, and produces a reconciliation framework that your team can apply to reporting on an ongoing basis.

/ What's broken

What we find in 90% of Japan discrepancy audits

Three platforms each claiming conversions independently

Japan is one of the very few markets where three major ad platforms — Google Ads, Yahoo Japan Ads, and Meta — each hold enough audience share to run simultaneously and each generate conversion claims independently. Without a unified attribution model, the same customer journey is credited to whichever platform last touched the user before conversion, and in many cases all three platforms claim partial or full credit for the same conversion event. The combined conversion total across all three platforms routinely exceeds actual conversion volume.

Phone and call centre conversion data completely absent from ad platform reporting

In Japan, phone enquiries represent a disproportionately large share of actual business conversions compared with most other markets. Where businesses operate a call centre or receive significant inbound call volume, this data typically lives in a CRM or telephony platform that has no connection to Google Ads, Yahoo Japan Ads, or Meta. All three platforms are therefore optimising against web-only conversion signals while a significant — and in some sectors, dominant — portion of actual outcomes is invisible to them.

GA4 conversion counts that match neither ad platform total

GA4 operates on its own attribution model and applies deduplication differently from both Google Ads and Yahoo Japan Ads. The GA4 conversion count for Japan campaigns typically sits below the combined ad platform total and above no single platform's figure — a position that makes it difficult to use as a reconciliation anchor. The difference between GA4 and ad platform totals is rarely explained in reporting, leaving analytics teams unable to determine which figure, if any, is closest to the truth.

CRM lead data with no attribution linkage to ad platforms

For B2B and service businesses in Japan, lead data lives in a CRM such as Salesforce or HubSpot, but the UTM parameters or click IDs that would connect each CRM record to the ad campaign that produced it are frequently absent or corrupted. The CRM cannot say which platform drove which lead, and the ad platforms cannot be verified against the CRM because the data link was never established. Budget decisions are therefore made on platform-reported figures that cannot be cross-referenced with actual pipeline or revenue data.

/ What we engineer

What the discrepancy audit covers

Each workstream is built by the team that audits it, and wired into the rest of your growth system.

Three-platform gap matrix

We pull conversion data from Google Ads, Yahoo Japan Ads, Meta, and GA4 for a consistent time period and build a gap matrix that shows exactly where conversion counts diverge between each layer. We quantify the overlap between platforms — the share of conversions that are being claimed by more than one platform for the same user journey — and document the attribution settings and conversion windows in use at each platform that contribute to the divergence.

Call centre and phone conversion data reconciliation

We work with your CRM or call centre data to map inbound call volume against the ad campaign data for the same period. Where call tracking is partially in place — through Google forwarding numbers or Yahoo Japan's call extension tracking — we assess what proportion of call volume is captured and what proportion remains invisible. We document the scale of the phone conversion gap and provide a framework for closing it, including options for connecting call centre data to ad platform offline conversion imports.

Root cause identification across all layers

For each significant gap in the matrix, we trace the discrepancy to its root cause. In Japan accounts, common root causes include three-platform attribution overlap, absent call conversion tracking, Yahoo Japan Ads using a different attribution window from Google Ads, GA4 cross-domain tracking failures on Japanese-language domains, and CRM records missing the click ID data required for ad platform attribution. Each root cause is documented with evidence from the data.

Reconciliation methodology

We develop a reconciliation methodology specific to the Japan three-platform environment. This includes rules for how to handle overlapping conversion claims across Google Ads, Yahoo Japan Ads, and Meta; how to incorporate call centre data into a unified performance view; and which attribution model should serve as the basis for cross-platform comparison. The methodology is documented for use by your team in routine reporting.

Unified reporting framework

We build the specification for a unified reporting framework that draws on all active data sources — ad platforms, GA4, CRM, and call centre data where available — and presents a single reconciled view of Japan paid acquisition performance. The framework accounts for the three-platform structure specific to Japan and is designed to produce numbers that are consistent across reporting cycles.

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/ Common questions

FAQ

Straight answers on scope, timelines and cost. Anything else, ask us directly.

Ask us directly
Why is the Japan three-platform problem more severe than in other markets?

Most markets are effectively single-search-platform environments where Google Ads accounts for the vast majority of paid search spend. Japan is one of the few markets where Yahoo Japan Ads retains significant paid search market share alongside Google. Running three independent platforms — Google Ads, Yahoo Japan Ads, and Meta — each generating conversion claims against the same customer journeys, without any unified attribution or deduplication, produces a level of overlap that does not exist in markets where only one search platform is active. The combined conversion total across three platforms can be two to three times the actual number of customer conversions.

How do you reconcile call centre data with ad platform data?

The reconciliation depends on what data is available. Where call tracking is partially implemented — through Google forwarding numbers or Yahoo Japan call extensions — we assess what proportion of call volume is captured by existing tracking and what proportion is invisible. Where call centre records exist in a CRM or telephony platform, we map inbound call volume and timing against ad platform click data for the same period to estimate the ad-attributed share of calls. The reconciliation plan documents what is measurable now and what would require additional tracking implementation to measure precisely.

Does the audit cover Yahoo Japan Ads as well as Google and Meta?

Yes. The Japan discrepancy audit covers all three platforms — Google Ads, Yahoo Japan Ads, and Meta — plus GA4 and CRM or call centre data where available. Treating Yahoo Japan Ads as a separate, unrelated system is one of the principal causes of discrepancy in Japan accounts, and the audit specifically addresses how to reconcile its attribution model and conversion windows with those of Google and Meta.

How long does the audit take?

The audit is delivered within 5 business days of receiving access to all relevant platforms. If access to Yahoo Japan Ads or the CRM takes additional time to arrange, we communicate any timeline adjustment immediately. Most Japan discrepancy audits are completed within the 5-day window.

Our Japan accounts are managed by a local agency. Can they remain in place during the audit?

Yes. The audit requires read-only access to the accounts and does not require involvement or cooperation from the managing agency. Your agency can continue running campaigns without disruption while the audit is in progress. Many clients share the findings and reconciliation methodology with their agency after delivery and use the report as a brief for implementing the recommended changes.

/ Our team

The people behind the work.

Not a black box. Real specialists you can call, with their names on the work.

About us
Hawrry Bhattarai

Hawrry Bhattarai

Google Ads Expert

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Get a reconciled view of what three platforms and your call centre data are actually measuring

The discrepancy audit maps every conversion gap across Google Ads, Yahoo Japan Ads, Meta, GA4, and your CRM or call centre data. It quantifies three-platform attribution overlap, documents the scale of invisible phone conversion volume, identifies the root cause of every significant divergence, and produces a reconciliation methodology and unified reporting framework your team can apply to Japan reporting on an ongoing basis. No retainer is required and no changes are made to your accounts during the process.

Three-platform gap mapping · Call centre data reconciliation · Unified reporting framework
Request a Data Discrepancy Audit View the evidence