The requirements that the taxpayer must meet to issue CFDI are:

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Have a valid Advanced Electronic Signature. (FIEL)
Process at least one Digital Seal Certificate (CSD)
Have a computer system for generating Electronic Invoices 2011.
Send electronic invoices to the authorized certification provider (PAC) for validation
Figure 1 broadly illustrates the process for generating a CFDI:

Generate an XML file
Send the XML to a PAC for verification and generation of a Digital Tax Stamp.
Insert the Digital Tax Stamp into our XML within Uganda Mobile Database the Complement node.
Send the CFDI to the client.


Figure 1. Process to generate a CFDI.

Generating the XML file
The XML file to be generated must comply with the rules defined in Annex 20 of the 2010 Miscellaneous Tax Resolution published by the SAT, which specifies:

The structure that the CFDI should have
The way of generating the digital stamp
The use of the mandatory complement: Digital Tax Stamp
To create the XML following the defined structure, we download the XML schema available.