A new version of the ECOT supply has been put into production, which includes the possibility of requesting it at a later date.

To use this feature you need to use the new service URL:

Generic
https://ws.ia.aeat.es/wlpl/SUWS-JDIT/ws/ecotws/ECOTGENV3SOAP

Contracting with the Public Sector (ECOT101)
https://ws.ia.aeat.es/wlpl/SUWS-JDIT/ws/ecot101ws/ECOT101V3SOAP

Transport and road authorization (ECOT102)
https://ws.ia.aeat.es/wlpl/SUWS-JDIT/ws/ecot102ws/ECOT102V3SOAP

Public Subsidies (ECOT103)
https://ws.ia.aeat.es/wlpl/SUWS-JDIT/ws/ecot103ws/ECOT103V3SOAP

Residence and work permits for foreigners (ECOT104)
https://ws.ia.aeat.es/wlpl/SUWS-JDIT/ws/ecot104ws/ECOT104V3SOAP

Documentation with details can be found at:

Web Service Specification for Tax Obligations (ECOT101-ECOT102-ECOT103-ECOT104)

Tax Obligations Web Service Specification - Generic (ECOTGEN)