Connecting to Zenfi's credit, tax and spending data

Three separate backends feed the Zenfi app, and they barely resemble each other. One is a credit-bureau pull from Buro de Credito or Circulo de Credito. One is an authenticated session against SAT, Mexico's tax authority, that retrieves a taxpayer's fiscal documents. The third is Zenfi's own ledger of income, expenses and credit-card movement. An integrator who wants this data is really asking for three different connectors that arrive as one stream. The fastest way to make that stream useful is to treat the events the app already raises — a new CFDI invoice, a score change, an identity-theft flag — as pushes you receive rather than state you keep re-fetching.

Bottom line: the bureau and SAT layers ride established, consent-bound rails, so a connector there is durable. The consolidated ledger that Zenfi shows the user is the piece that needs protocol work against the app itself. We build all three and hand back one normalized feed.

The data Zenfi surfaces, domain by domain

Authorized routes into Zenfi's data

Credit-bureau integration, on the bureau's own rails

Both Buro de Credito and Circulo de Credito publish developer products for credit reports and scores. Circulo's APIHub, for example, authorizes a report with a NIP and an identity check before releasing it (per its developer portal). Access is the consumer self-consultation that Mexican credit-information law allows, so it returns the full report and score without registering as a lending inquiry. This route is the most durable of the set, and we handle the bureau onboarding with you during the engagement.

SAT extraction under the user's consent

The fiscal data comes from an authenticated session against the SAT portal using the account holder's RFC and credentials. We analyze the document flow and pull the Constancia de Situacion Fiscal, the Opinion de Cumplimiento and CFDI records. It is durable but tracks SAT's own changes — see the engineering notes on the Cedula de Datos Fiscales below.

App interface integration for the consolidated view

The single ledger Zenfi presents — categorized spending, card movement, the unified timeline — is assembled inside the app. To reproduce it we do protocol analysis of Zenfi's authenticated mobile traffic, under the account holder's authorization, as data extraction for interoperability. Lighter to stand up than the regulated rails, and the right choice when a project wants the app's own framing rather than raw bureau and SAT payloads.

For most builds the bureau and SAT connectors carry the weight and the app-interface route fills in the consolidated ledger. We say which mix fits once we see what the project actually needs from the data.

What you receive

The headline deliverable is runnable code, not a binder.

• Source for the key surfaces — Python or Node.js clients for the bureau pull, the SAT session and the transaction read, structured so each can run on its own.
• Webhook handlers for the invoice, score-change and identity-alert events, with the reconciliation logic that maps each event back to a stored record.
• An automated test suite that exercises every connector against a consenting account, so a SAT or bureau change shows up as a failed assertion rather than a quiet gap.
• Sync design — what is pushed, what is re-pulled on a cursor, and how the two merge into one feed.
• An OpenAPI description of the normalized endpoints, plus a short auth-flow report covering the bureau NIP step, the SAT credential session and the app token chain.
• Interface documentation and data-retention guidance sized to the consent basis each route depends on.

A webhook handler against the invoice feed

Illustrative, not copied from production — field names are confirmed during the build. It receives a CFDI notification, dedupes on the fiscal folio so a re-sent event is harmless, then asks the normalized layer for the matching record.

// Node.js — Zenfi event receiver (illustrative)
app.post('/zenfi/events', verifySignature, async (req, res) => {
  const evt = req.body;                 // { type, folio_fiscal, occurred_at, ... }
  // CFDI folio (UUID) is the natural idempotency key
  if (await seen(evt.folio_fiscal)) return res.sendStatus(200);

  switch (evt.type) {
    case 'invoice.received':
    case 'invoice.issued': {
      const cfdi = await zenfi.fiscal.getInvoice(evt.folio_fiscal);
      await ledger.upsertInvoice(normalizeCFDI(cfdi));
      break;
    }
    case 'score.changed': {
      const report = await zenfi.bureau.getReport({ consent: evt.consent_id });
      await store.putScore({ value: report.score, factors: report.factors });
      break;
    }
    case 'identity.alert':
      await alerts.raise(evt);           // theft flag from the bureau layer
      break;
  }
  await mark(evt.folio_fiscal);
  res.sendStatus(200);
});

Surfaces without a native push — the consolidated transaction view, say — are read on a cursor and re-emitted in the same event shape, so the handler does not care whether a record arrived by push or poll.

Where teams plug this in

• A lender pre-qualifies an applicant from the consented bureau report and score, then verifies declared income against CFDI totals from SAT.
• An accounting tool keeps a client's invoice ledger current by consuming the issued and received events as they arrive.
• A financial-wellness product mirrors Zenfi's own score-improvement signals to coach a user on utilization and payment history.
• A supplier-onboarding flow pulls the Opinion de Cumplimiento to confirm a counterparty is current with the tax authority.

Authorization and the Mexican rulebook

Every route here rests on the account holder's own authorization, and that is the dependable basis — not a pending standard. Three frameworks touch this data. Credit-bureau access falls under the Ley para Regular las Sociedades de Informacion Crediticia, which is why the bureau requires an explicit NIP-backed consent per consultation; we keep those consent records and honor revocation. Personal data is governed by Mexico's federal data-protection regime (the LFPDPPP and its ongoing reorganization), so we minimize what is stored and scope retention to the purpose. Open finance under Article 76 of the Ley Fintech is the forward-looking piece: the CNBV and Banxico were tasked with publishing the API standards, and as of this writing the secondary rules remain largely unissued beyond open data for ATMs, with the regulator only recently moving on broader open-finance provisions (per LatamFintech and Chambers reporting). We treat Article 76 as where the route may eventually formalize, not as a rail you can ride today.

Engineering notes specific to Zenfi

Two things about this app shape the build more than anything in a generic plan.

Consent windows on the bureau side. A bureau report is bound to a single authorized consultation, not a standing feed. We design the sync to re-request authorization within the bureau's window instead of serving a cached report as if it were live, and we keep the self-consultation path so monitoring never registers as a hard inquiry against the user.

SAT is mid-migration. The 2025 rollout of the Cedula de Datos Fiscales is changing how taxpayer data is surfaced alongside the traditional Constancia de Situacion Fiscal. We map both paths and normalize them into one fiscal-profile schema, so extraction keeps working while SAT shifts users across.

Invoice events repeat. CFDI notifications can be re-sent, so reconciliation keys on the fiscal folio (UUID); a duplicated event resolves to the same record instead of double-counting a payment. Access to a sandbox or a consenting account is arranged with you during onboarding — it is part of how the project runs, not something you assemble before we start.

Working with us

A first drop for Zenfi usually covers the bureau pull and the SAT session inside one to two weeks, with the transaction read following close behind. We can hand over runnable source plus its documentation, from $300, paid only after delivery once you have it working and you are satisfied. If you would rather not host anything, call our endpoints instead and pay per call, with nothing upfront. Tell us the app and what you need from its data, and we scope the rest. Start a Zenfi integration

How this brief was put together

Written in June 2026 against Zenfi's store listings and the primary sources for each route: the credit bureaus' developer material, SAT's own document pages, and current reporting on the state of Mexican open finance. Specifics here are drawn from those, not assumed.

• Circulo de Credito — Reporte de Credito + FICO Score (developer portal)
• Buro de Credito — API product catalog
• SAT — Constancia de Situacion Fiscal
• LatamFintech — CNBV's first open-finance rules in Mexico

Reviewed 2026-06-07 — interface mapping by OpenFinance Lab integration engineering.

Other Mexican credit and tax apps in the same orbit

Named so you can see where a single integration layer would reach across the category. Neutral context, no ranking.

• Coru — financial-product comparison and credit guidance, with bureau-linked insights.
• Destacame — free credit-score checks through a direct alliance with Buro de Credito.
• Vexi — a credit card aimed at first-time borrowers, with in-app credit tracking.
• Stori — credit cards and deposit accounts for the underbanked, holding card and account records.
• Klar — credit, savings and investment products with in-app spending data.
• Kueski — short-term consumer lending with its own repayment and behavior data.
• Fondeadora — a digital account and card with transaction and balance history.
• Kubo Financiero — peer-to-peer lending and savings, holding loan and investment positions.

Screens from the app

Questions integrators ask about Zenfi

How do you read the credit report and score without hurting the user's bureau standing?

The same way a consumer-facing pull works: a self-consultation against Buro de Credito or Circulo de Credito, authorized by the account holder with a NIP and identity check, which does not register as a lending inquiry and does not move the score. We wire the integration to that consent path, not to a hard credit pull.

Can new invoices, score moves and identity alerts arrive as webhooks instead of polling?

Yes. Zenfi already raises notifications for issued and received CFDI invoices and for identity-theft flags, so we model those as outbound events your service receives, then reconcile each one against the stored ledger. Where a surface has no native push, we run a cursor-based re-pull on a schedule and emit the same event shape so your handler stays uniform.

How do you keep SAT extraction working as the portal shifts to the Cedula de Datos Fiscales?

We map both paths: the established Constancia de Situacion Fiscal and Opinion de Cumplimiento flows, and the newer Cedula de Datos Fiscales that SAT introduced in 2025. The session logic detects which the portal serves and normalizes both into one fiscal-profile schema, so the feed survives the migration.

For a bureau-plus-SAT build against Zenfi, what is the first thing we receive?

Runnable source for the credit-bureau pull and the authenticated SAT session, an OpenAPI description of the normalized endpoints, and a test suite that exercises both against a consenting account. That first drop lands in one to two weeks; documentation ships with it.