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# How to Automate Credit Underwriting with SAT Data via API

Practical guide to integrating SAT data into automated underwriting workflows: endpoints, derived metrics, and complete workflow.

Thought Leadership March 24, 2026 CRiskCo 

The most common challenge in SME lending in Mexico is not risk appetite. It is visibility. A large share of Mexican businesses — particularly micro and small enterprises — have no audited financials, no credit bureau history, and no formal reporting structure that a traditional underwriter can work from.

  

What they do have is SAT data.

  

Since electronic invoicing became mandatory for most Mexican businesses, the SAT database holds years of granular transaction data: who sold what, to whom, in what amounts, and whether the tax obligations behind those transactions were fulfilled. For an underwriter, this is an income statement, a customer concentration report, a compliance check, and a payment behavior signal — all accessible through a single API integration.

  

## What you can derive from SAT data through the CRiskCo API

  

**Revenue proxy (AR invoices):** The \`/ar-transactions/invoices\` endpoint returns sales invoices over any date range. Sum of invoice totals over a trailing 12 months provides a revenue proxy more reliable than self-reported revenue because it comes directly from SAT.

  

**Cost and expense structure (AP transactions):** The \`/ap-transactions/invoices\` and \`/ap-transactions/expenses\` endpoints show what the business is spending and on whom. Gross margin can be approximated by comparing AR and AP invoice volumes.

  

**Standardized financial reports:** \`/financialreports/standard/profitandloss\` and \`/financialreports/standard/balancesheet\` return CRiskCo-normalized financial statements mapped to a consistent schema — regardless of which ERP or accounting system the applicant uses. Key ratios (DSO, Quick Ratio, Debt Ratio) are derived from these.

  

**Customer concentration:** The distribution of receiver RFCs in AR invoices reveals whether a business is dependent on a small number of clients. High concentration in a single buyer increases credit risk if that relationship ends.

  

**SAT compliance status:** \`/GetCompanyTaxStatus\` returns the Opinión de Cumplimiento — POSITIVO or NEGATIVO. A NEGATIVO opinion lists the specific outstanding obligations by period. Any negative status should be a mandatory review trigger in your underwriting workflow.

  

**Historical FinScore:** \`/GetHistoricalFinscore\` provides CRiskCo's proprietary risk score over time. A declining trend in the 3 months before application is a meaningful signal even if the latest score appears acceptable.

  

## A practical underwriting workflow

  

A typical integration with the CRiskCo API looks like this:

  
-   **Applicant provides RFC** — no document upload required.
-   **Validate the RFC** — call \`/ValidateRFC\` to confirm the company is registered and active with SAT.
-   **Onboard and connect to SAT** — call \`/OnboardingSatIntegration\` with the applicant's RFC and CIEC credentials. CRiskCo pulls invoices, payments, and declarations directly from SAT.
-   **Retrieve applicantId** — call \`/get-applicants\` filtered by RFC. This ID is used in all subsequent calls.
-   **Pull all financial data** — call \`/grouping/applicant-financials\` to get the full picture in one API call: standardized reports, raw data, documents, and analytics.
-   **Check tax compliance** — call \`/GetCompanyTaxStatus\` and \`/GetHistoricalFinscore\` in parallel.
-   **Render decision or route to review** — your scorecard receives structured JSON, calculates the score, and returns a decision.
  

The full workflow runs in under 60 seconds from RFC submission. No manual document review. No waiting for the applicant to upload bank statements.

  

## What the data doesn't cover — and how to compensate

  

SAT data is powerful but not complete. Three limitations worth noting for underwriters:

  
-   **CFDI does not confirm cash collection.** An invoice exists even if payment was never received. For working capital products, cross-reference AR invoices with AR payments from \`/ar-transactions/payments\` to assess actual collection behavior.
  
-   **Informal activity below SAT thresholds.** Very small businesses may have limited invoice history. Cross-reference with employee data from \`/GetEmployeesDetails\` — active payroll alongside thin invoice history may indicate informal revenue streams not yet captured in SAT.
  
-   **Invoice volume alone doesn't reveal profitability.** Always pull both AR and AP transaction data. A business with high invoice volume but also high AP spending may have thin margins. The standardized P&L from \`/financialreports/standard/profitandloss\` normalizes this across ERP types.
  

* * *

  

CRiskCo provides direct SAT data access, standardized financial reports, and historical risk scoring through a single API. [Read the full technical integration guide →](/en/developers/api-guide) or [contact our team →](https://meetings.hubspot.com/israel-madrid/lead-discovery).

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