mx_rfc_certificate

Mexican tax status certificate (constancia de situación fiscal)

SAT tax status certificate (tax identification card): RFC, tax regime, tax address and registry status; digitally sealed PDF.

Category: Tax
Country: Mexico
Extracted fields: 10 fields
Cost: 1 credit

mx_rfc_certificatespecimen

Rfc
Curp
Holder name
Id cif
Tax regimes
Status
Operations start date
Address
Postal code

What it checks

National identifiers. Official checksum or format of the number (NIF, CPF, CURP, RUT, SSN…).mx_rfc, mx_curp, postal_code
Postal code. Postal code format of the country.
Holder. Name, number or date of birth match what you expect.
Recency. Issued less than N days ago.
PDF electronic signature. PAdES signature verified when the original PDF is sent.

Extracted fields

Rfcrfc
Curpcurp
Holder nameholder_name
Id cifid_cif
Tax regimestax_regimes
Statusstatus
Operations start dateoperations_start_date
Addressaddress
Postal codepostal_code
Issue dateissue_date

Sample request

curl https://api.constaia.com/v1/analyze \
  -H "Authorization: Bearer $CONSTAIA_API_KEY" \
  -F "file=@document.pdf" \
  -F 'options={
    "expect": "mx_rfc_certificate",
    "checks": {
      "max_age_days": 90,
      "holder": {
        "full_name": "Carmen Especimen Ruiz"
      }
    },
    "storage": "none"
  }'

Sample response

Fictitious data. Shortened response.

200 OK · application/json

{
  "id": "an_01J9Z3K8QW4T6Y2B7N5M1R0PXC",
  "object": "analysis",
  "status": "completed",
  "livemode": false,
  "document": {
    "type": "mx_rfc_certificate",
    "label": "Mexican tax status certificate (constancia de situación fiscal)",
    "confidence": 0.97
  },
  "verdict": {
    "expected": [
      "mx_rfc_certificate"
    ],
    "match": true,
    "status": "valid",
    "reasons": [
      {
        "code": "type_match",
        "severity": "info",
        "message": "The document is: Mexican tax status certificate (constancia de situación fiscal)."
      }
    ]
  },
  "fields": {
    "rfc": {
      "value": "PEPJ850730AB7",
      "confidence": 0.99,
      "validated": true
    },
    "curp": {
      "value": "PEPJ850730HDFRRN01",
      "confidence": 0.98,
      "validated": null
    },
    "holder_name": {
      "value": "JUAN PEREZ PEREZ",
      "confidence": 0.97,
      "validated": null
    },
    "id_cif": {
      "value": "21010123456",
      "confidence": 0.96,
      "validated": null
    },
    "tax_regimes": {
      "value": [
        "Régimen Simplificado de Confianza"
      ],
      "confidence": 0.99,
      "validated": null
    },
    "status": {
      "value": "ACTIVO",
      "confidence": 0.98,
      "validated": null
    },
    "operations_start_date": {
      "value": "2021-01-01",
      "confidence": 0.97,
      "validated": null
    },
    "address": {
      "value": "C. HIDALGO 10, COL. CENTRO, CUAUHTEMOC, CIUDAD DE MEXICO",
      "confidence": 0.96,
      "validated": null
    },
    "postal_code": {
      "value": "06000",
      "confidence": 0.99,
      "validated": null
    },
    "issue_date": {
      "value": "2026-09-01",
      "confidence": 0.98,
      "validated": null
    }
  },
  "checks": [
    {
      "code": "id_number",
      "passed": true,
      "message": "id_number"
    }
  ],
  "warnings": [],
  "storage": {
    "mode": "none",
    "file_deleted_at": "2026-09-29T10:00:02Z",
    "expires_at": null
  },
  "usage": {
    "credits": 1,
    "pages": 1
  }
}

FAQ

Does Constaia prove the document is authentic?

No. It checks the type, data consistency and your rules, and flags signals such as a possible edit or a screen photo. That does not prove authenticity.

Is a copy of the document kept?

No, unless you ask for it. With storage "none" (the default) the file is deleted when the analysis ends.

And for the record…

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