Hello Gianni,
I work in Timestamp Group, an IFS Ibérica (IFS for Spain and Portugal) partner.
We have experience doing the setup for all Localization for Spain and Portugal.
Let us know if you need support 
Regards.
Hi @TimeMarBou,
Thanks for your answer, but right now all has been put in place to send manually. We need to know, how we could send the files direct to SII servers without any intervention of my people or third-party companies in charge to transfer to us.
Thanks,
Gianni Neves
Hello,
Through Routing Rules and Routing Addresses setup you can communicate directly to the SII Webservice.
That is setup once and then you won’t need third-party or any other intervention (just update certificates).
Regards.