Disclosed are example methods, systems, and devices for allowing callercomputing devices toauthenticate calls via a service provider computing system. Users may opt tohave entitiesregister to contact the user with a positive lD, icon, or other notificationon the user's computingdevice transmitted by the service provider computing system. A callercomputing device mayuse a unique security token of the user to activate the notification on theuser's device. The userdevice may be used to exert control over the security token via a serviceprovider clientapplication running on the user device. The caller computing device mayinitiate authenticationvia an API call to the service provider computing system. The caller computingdevice is able tohave items (text, images, documents, etc ) delivered to the user computingdevice ifauthenticated.
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