1. A method of operating a computer system comprising: performing by a processor of an authentication gateway computer server: receiving, through a network interface of the authentication gateway computer server, an eCommerce authentication request from a merchant web server; processing a plurality of content items contained in the eCommerce authentication request through different inputs of a neural network model to generate a risk score, wherein the neural network model comprises an input layer comprising input nodes, a sequence of neural network layers each comprising a plurality of weight nodes, and an output layer comprising an output node, wherein the processing a plurality of content items contained in the eCommerce authentication request through different inputs of a neural network model to generate a risk score comprises: operating the input nodes of the input layer to each receive a different one of the content items of the eCommerce authentication request and output a value; operating the weight nodes of a first one of the sequence of neural network layers using weight values to mathematically combine values that are output by the input nodes; operating the weight nodes of a last one of the sequence of neural network layers using weight values to mathematically combine values output by a plurality of weight nodes of a previous one of the sequence of neural network layers; and operating the output node of the output layer to combine values output by the weight nodes of the last one of the sequence of neural network layers to generate the risk score; and selectively routing, based on whether the risk score satisfies a defined rule, the eCommerce authentication request through the network interface of the authentication gateway computer server toward an authentication computer server, separate from the authentication gateway con titer server, for additional authentication, wherein selectively routing the eCommerce authentication request through the network interface of the authentication gateway computer server to the authentication computer server for additional authentication comprises: responsive to the risk score failing to satisfy the defined rule, generating a successful response for the eCommerce authentication request to the merchant web server without sending, the eCommeree authentication request to the authentication computer server, wherein the successful response is generated to appear to originate from the authentication computer server, and responsive to the risk score satisfying the defined rule, transferring the eCommerce authentication request to the authentication computer server.