JUMP TOJavascript APIJavascript API documentationTracking audiences and goalsIdentifying visitorsUpdating a profileGetting the visitor IDInserting dynamic contentSetting a keyRetrieving a keyList of Unless propertiesLaunching a ComponentTracking consentOpting inOpting outREST APIUnless REST API documentationAuthorizationAuthorize userRequest tokensCall APIRefresh tokensContacts APIImporting contactspostRetrieving contactsgetUpdating a contactpostDeleting a contactdeleteRetrieving event logsgetPowered by Opting inSample code JavaScriptTxt.optInTracking() This function opts you in to tracking. JavaScriptTxt.optInTracking()