In the electronic office (https://www.agenciatributaria.gob.es) you will find the following links to request refunds, carry out formalities and obtain information:
If you need more information to complete the form 360 use the following Form 360 submission guide.
https://www1.agenciatributaria.gob.es/ES13/S/RH03XZSWTU03?NUM=ASWTUTORIAL_IXVRM360_301
If you are a developer you will want to access the public Tax Agency information on the notice board for developer companies
http://www.aeat.es/padres/eedd/index.htm
Specifically, you will be interested in the following documents:
Form 360 registry design
http://www.aeat.es/AEAT/Contenidos_Comunes/La_Agencia_Tributaria/Ayuda/
/Disenyos_de_registro/Ayudas/DR360_10.pdf
Specifications for submission
http://www.aeat.es/padres/eedd/descarga/2009/espes360e00v10.pdf