Login button shortcode

Authentication URL Shortcode https://idp.iamfas.belgium.be/fas/oauth2/authorize?response_type=code&scope=openid%20profile%20egovnrn&client_id=Site_web_logement.brussels&acr_values=urn%3Abe%3Afedict%3Aiam%3Afas%3Acitizen%3ALevel450&state=3965a359ccf807d48901c7bcd6f6ae0b&nonce=12444442&redirect_uri=https%3A%2F%2Fwww.logement.brussels%2FoauthFAS%2Fauth