Methodology
How WACRM researches its WhatsApp insights
This page explains how WACRM researches its WhatsApp insights: every fact comes from a primary source read on a stated date, measured figures are kept apart from labelled estimates and illustrative scenarios, each article states its own limitations, and each one has a review date set by how fast its facts change.
Where do the facts come from?
From primary sources only: Meta for message prices, central banks for payment rails and tax authorities for e-invoicing. Each article lists its sources at the end with the date each one was checked. These are all the sources the insights cite today:
- ANPD — Institucional (checked )
- Banco Central do Brasil — Pix (checked )
- Banco Central do Brasil — Pix Automático (checked )
- Banco Central do Brasil — Pix Cobrança (checked )
- Banco de México — Información sobre CoDi® Cobro Digital (checked )
- Banco de México — Información sobre el SPEI® (checked )
- Banco de México — MI SPEI® (how to send a transfer) (checked )
- Dimo® Banco de México (checked )
- Meta for Developers — Getting opt-in (checked )
- Meta for Developers — Payments API for Brazil (checked )
- Meta for Developers — Pricing on the WhatsApp Business Platform (rate card) (checked )
- Meta for Developers — Template categorization (checked )
- Meta for Developers — WhatsApp Platform pricing (checked )
- Orden Jurídico Nacional — Ley Federal de Protección de Datos Personales en Posesión de los Particulares (DOF 20 March 2025, PDF) (checked )
- Portal da Nota Fiscal Eletrônica (checked )
- SAT — Formato de factura (Anexo 20), CFDI 4.0 (checked )
- SAT — Preguntas frecuentes CFDI 4.0 (PDF) (checked )
How are measured facts, estimates and examples labelled?
A figure is only shown as a fact when it was read from a primary source. Anything else carries a label, so a reader can tell the two apart:
| Label | What it means |
|---|---|
| Measured fact | Read from a primary source; the source and the date it was checked are listed at the end of the article. |
| Estimate | Labelled as an estimate and never shown as a fact. |
| Illustrative scenario | A worked example, marked "Illustrative scenario, not a customer case". It quotes no customer numbers. |
What are the limits of each insight?
Every article ends with its limitations: what could not be read, what is still to be confirmed with an authority and which figures are left out because none was checked against a primary source.
WhatsApp Business in Mexico 2026: Pricing and CFDI
SAT's own portal page on electronic invoicing and the Chamber of Deputies copy of the LFPDPPP could not be read, so later amendments to the March 2025 text are not covered and only Articles 7, 8, 15 and 16 are paraphrased. Whether a WhatsApp message counts as CFDI delivery is to be confirmed with SAT. Meta does not state who may open an MXN messaging account. No bank transfer fees, no current Dimo or CoDi usage figures, no search-volume data and no WhatsApp user count for Mexico are given, because none was checked against a primary source.
WhatsApp Business in Brazil 2026: Pricing, Pix, NF-e
The full LGPD text could not be read for this edition, so no article of the law is quoted. Whether a WhatsApp message counts as official NF-e delivery is to be confirmed with SEFAZ. Meta does not state Payments API eligibility on its Brazil page. No search-volume data was measured, and no WhatsApp user count for Brazil is given because none was checked against a primary source.
Pix Payment Reminders on WhatsApp in Brazil
Dynamic QR codes and batch charges are optional for Pix participant institutions, so what you can send depends on your bank or payment provider. Meta does not state Payments API eligibility on its Brazil page. Banco Central's Pix statistics page could not be read for this edition, and no Brazilian rule on reminder frequency or collection messages was checked: the schedule below is an illustration, not legal guidance.
How often is each insight reviewed?
Each insight has a review date set by how fast its facts change: every quarter for articles that quote Meta's country message prices, less often for the others. The Updated date is the last real content change.
| Insight | Review cadence | Updated | Next review |
|---|---|---|---|
| WhatsApp Business in Mexico 2026: Pricing and CFDI | Every quarter | ||
| WhatsApp Business in Brazil 2026: Pricing, Pix, NF-e | Every quarter | ||
| Pix Payment Reminders on WhatsApp in Brazil | Every six months |
Questions about the methodology?
Do the insights use customer data?
No. The insights quote no customer numbers. A worked example is marked as an illustrative scenario, not a customer case.
What happens when a source cannot be read?
The article says so in its limitations and quotes nothing from that source. A figure that was not checked against a primary source is left out, not guessed.
How often are insights updated?
Each insight has a review date set by how fast its facts change: every quarter for articles that quote Meta's country message prices, less often for the others. The Updated date is the last real content change.
Is an insight legal or tax advice?
No. Where a rule still has to be confirmed with a tax authority or regulator, the article says so. Get legal or tax advice for your own case.
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