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Protocol for the implementation of the provision of tax information to Local Entities adhered to the Agreement for the Exchange of Tax Information and Collaboration in Collections Management (PROTEELL - June 2021)

3.3.1. Description of this information supply channel

Web services technology involves computer developments by the entity requesting information, for the implementation of the information collection system in its applications.

Once developed by the IT services, the authorised body will enter into its certificate request application the identification data of the interested party from whom it wishes to obtain information, the purpose of the request and the type of certificate requested. Before sending the request to the issuing body's web service, you must sign the request message. The signature of the request message will follow the XML-DSig protocol.

To send the request, a secure channel (SSL tunnel) will be established. The Tax Agency's web services require client authentication when establishing this channel. To successfully establish this tunnel, the electronic certificate used for this purpose must have been authorized by the AEAT.

Therefore, to send an application, one or more electronic certificates will be used at two times: for the signing of the petition and for the establishment of the secure channel. It is not necessary for these actions to be carried out with the same certificate, but it is necessary that this situation be communicated to the AEAT, which will associate them with the requesting body.

Once the request message has been generated and sent by the requesting body, the issuing body will check that it is authorized to invoke the requested web service. Once this check has been carried out, the issuing body will process the request, issuing a response (a document in XML format containing all the related data) electronically signed, which will be sent to the requesting body synchronously.

For more information, please contact:

CAT – AEAT Telephone Service Centre

  • Telephone: 901 200 349

  • E-mail: CATENTIDADES@CORREO.AEAT.ES

The technical specifications for making requests for information on bank deposits and investment funds through web services can be consulted in Index of web services for information supplies New window . These requests are answered immediately.