1. A system that mitigates digital fraud and abuse threats, the system comprising: an application program interface (API) that: receives digital event type data that define attributes of a digital event type that is susceptible to digital fraud; receives digital fraud policy that defines a plurality of digital processing protocols enabling automated decisioning of a disposal for digital event data classified as the digital event type; transmits, via a network, the digital event type data and the digital fraud policy to a remote digital fraud mitigation platform; at the remote digital fraud mitigation platform comprising one or more computing servers that comprise one or more computer processors and a memory storing computer-executable instructions that when executed by the one or more computer processors perform the steps of: using the digital event type data to configure a first computing node comprising an events data application program interface (API) or an events data computing server to detect digital events data, incoming from a plurality of digital events data sources, that classify as the digital event type; using the digital fraud policy to configure a second computing node comprising a decisioning API or a decisioning computing server to automatically evaluate and automatically select one digital event processing outcome of a plurality of digital event processing outcomes that indicates a disposal of the detected digital events data classified as the digital event type, wherein the digital fraud policy defines a digital fraud type and a digital threat score for the digital fraud type at each of a plurality of ordered sub-nodes of the second computing node, wherein the digital threat score at each of the plurality of sub-nodes is different, and wherein only when attribute values of the digital event data and/or a digital actor associated with the digital event data satisfy the digital threat score for the digital fraud type of one of the plurality of ordered sub-nodes, the digital event data and/or the digital actor data traverses the second computing node with a computed disposal; and implementing the digital fraud policy to evaluate one or more digital events, wherein implementing the digital fraud policy includes generating a disposal decision and disposing each of the one or more digital events according to the generated disposal decision, wherein the generated disposal decision includes one or more of automatically approving, holding, and cancelling an activity or transaction associated with the one or more digital events.