The PIN shall be 3 in length alphanumeric characters And it's generated by the Tax Agency.
The PIN you will receive on your mobile phone may have letters (excluding dyes) and/or digits (excluding zero, one, eight and nine).
For example, if you receive "XOI", the characters you will need to enter on the authentication screen will be the letters "equis", "o" and "i".
The PIN plus the key provided by us at the time of its request configures the access code that allows the formalities to be carried out electronically