The UBL e-Invoice validator is dedicated to the validation of UBL 2.1 e-Invoices. For further information read documentation at https://ec.europa.eu/cefdigital/wiki/display/CEFDIGITAL/eInvoicing. 

Several interfaces are available

• A web interface, at: https://www.itb.ec.europa.eu/invoice/upload.
  Validation through web form upload is provided to all users (i.e. via anonymous access) through the above link. Once a UBL invoice is uploaded, it is validated and a detailed report is presented to the user that can be downloaded (in GITB TRL format) and cross-checked against the submitted content.
• A SOAP web service for UBL 2.1 e-Invoice, WSDL at: https://www.itb.ec.europa.eu/invoice/api/validation?wsdl.

  An invoice can be validated via web service call to a GITB-compliant content validation service. 

  To facilitate use of the web service, a relevant SOAP UI test case is provided in B4InvoiceValidation-soapui-project.xml

• An e-mail, via the address: validate.invoice@gmail.com.

  Validation of invoices via email is enabled by emailing one or more invoices as attachments to the email address. Once validation is completed a reply is returned with an overview of the validation as the email body and the detailed validation reports (in GITB TRL format) as attachments.