AFIP WebService simulator PoC

[reingart]

Fake implementation for testing, mimicking government servers (WSDL SOAP based)

This idea should implement a standalone webserver with a SOAP XML interface, so new clients could use it to test implementations without using real world AFIP servers.

Also, to avoid flaky tests or recording XML requests and responses, this could be used in integration & end to end tests.

See server.py for an example using the SOAP library used in this project.

Major AFIP Web Services to simulate:

• WSAA (authentication and authorization)
• WSFEv1 (simple electronic invoice, for most customers)
• WSMTXCA (electronic invoice with details for large tax contributors)
• WSFEXv1 (electronic invoice for foreign trade)
• WSBFEv1 (electronic invoice for tax bonous)

Methods to implement:

• Query and retrieve last invoice number (CompUltConsultar)
• Query and retrieve an invoice (CompConsultar)
• Authorize an invoice (SolicitarCAE)

This could be done also with django or flask.
Example web2py-app for a Proof of Concept

For a quick initial ticket PoC, a minimal webservice using python http.server to respond with a basic XML response for the URL http://localhost/wsfev1/service.asmx.

Sample XML response for POST with header SOAPAction: "http://ar.gov.afip.dif.FEV1/FECompUltimoAutorizado":

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Header>
    <FEHeaderInfo xmlns="http://ar.gov.afip.dif.FEV1/"><ambiente>HomologacionExterno - efa</ambiente><fecha>2023-03-19T18:37:22.5736761-03:00</fecha><id>5.1.0.0</id>
   </FEHeaderInfo>
  </soap:Header>
  <soap:Body>
    <FECompUltimoAutorizadoResponse xmlns="http://ar.gov.afip.dif.FEV1/">
      <FECompUltimoAutorizadoResult>
        <PtoVta>3</PtoVta>
        <CbteTipo>3</CbteTipo>
        <CbteNro>1079</CbteNro>
      </FECompUltimoAutorizadoResult>
    </FECompUltimoAutorizadoResponse>
  </soap:Body>
</soap:Envelope>

Sample XML response for POST with header SOAPAction: "http://ar.gov.afip.dif.FEV1/FECAESolicitar":

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Header>
    <FEHeaderInfo xmlns="http://ar.gov.afip.dif.FEV1/"><ambiente>HomologacionExterno - efa</ambiente><fecha>2023-03-19T18:37:22.6518011-03:00</fecha><id>5.1.0.0</id></FEHeaderInfo>
  </soap:Header>
  <soap:Body>
    <FECAESolicitarResponse xmlns="http://ar.gov.afip.dif.FEV1/">
      <FECAESolicitarResult>
        <FeCabResp>
          <Cuit>20267565393</Cuit>
          <PtoVta>3</PtoVta>
          <CbteTipo>3</CbteTipo>
          <FchProceso>20230319183722</FchProceso>
          <CantReg>1</CantReg>
          <Resultado>A</Resultado>
          <Reproceso>N</Reproceso>
      </FeCabResp>
      <FeDetResp>
        <FECAEDetResponse>
          <Concepto>3</Concepto>
          <DocTipo>80</DocTipo>
          <DocNro>30500010912</DocNro>
          <CbteDesde>1080</CbteDesde>
          <CbteHasta>1080</CbteHasta>
          <CbteFch>20230319</CbteFch>
          <Resultado>A</Resultado>
          <Observaciones><Obs><Code>10217</Code><Msg>El credito fiscal discriminado en el presente comprobante solo podra ser computado a efectos del Procedimiento permanente de transicion al Regimen General.</Msg></Obs></Observaciones>
          <CAE>73123082701641</CAE><CAEFchVto>20230329</CAEFchVto>
        </FECAEDetResponse>
      </FeDetResp></FECAESolicitarResult>
    </FECAESolicitarResponse>
  </soap:Body>
</soap:Envelope>

For more info about http module: https://pymotw.com/3/http.server/