Adding a TFD element

You can add a signed TimbreFiscalDigital (TFD) element to a signed CFDI document using the key and certificate of a PAC.
Agrega una TimbreFiscalDigital (TFD) Elemento firmado a un documento firmado CFDI utilizando la clave y el certificado de un PAC.

The existing CFDI document must already have been signed by the issuer with a sello field. The new TFD element will have a new UUID (different each time) and be timestamped with the system clock. The selloSAT signature is created using the supplied key and certificate pair, either for a genuine PAC or for testing purposes. Only version 3.2/3.3 CFDI documents with full `cfdi:` namespace prefixes can be used.

SIGNXML command

Use the "-f" option in the SIGNXML command.

FirmaSAT SIGNXML -f -s @ -k pac.key -p 12345678a -c pac.cer -i V3_2-signed.xml -o V3_2-tfd.xml

C/C++ SAT_SignXml() function

Use the SAT_TFD option with the SAT_SignXml function.

printf("\nADD A TFD ELEMENT TO A SIGNED CFDI DOCUMENT USING PAC KEY: \n");
fname   = "V3_2-signed.xml";
newname = "V3_2-tfd.xml";
certfile = "pac.cer";
keyfile = "pac.key";
password = "12345678a";
n = SAT_SignXml(newname, fname, keyfile, password, certfile, SAT_TFD);
printf("SAT_SignXml(SAT_TFD, '%s'-->'%s') returns %ld\n", fname, newname, n);
assert(n == 0);

VB6/VBA SAT_SignXml() function

Debug.Print (vbLf & "ADD A TFD ELEMENT TO A SIGNED CFDI DOCUMENT USING PAC KEY:")
fname = "V3_2-signed.xml"
newname = "V3_2-tfd.xml"
certfile = "pac.cer"
keyfile = "pac.key"
password = "12345678a"    ' CAUTION: DO NOT HARD-CODE REAL PASSWORDS!
n = SAT_SignXml(newname, fname, keyfile, password, certfile, SAT_TFD)
Debug.Print "SAT_SignXml(SAT_TFD, '" & fname & "'-->'" & newname & "') returns " & n