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Hi Andrea, the SAML Single Sign On Magento Extension add SAML support to Magento turning it in a SAML SP to be conected with an IdP.
If your customer provided to you SAML IdP data you will be able to add it at the "IdP Setting" section and at the status section you will be able to find a link to the SP metadata that you need to share with the IdP administrator.
Review the documentation of the extension where is described that info I shared.