An integrated gateway system configured to perform: receiving online data transmissions from a user computing device of a user; authenticating that a source of the online data transmissions matches the user computing device; transmitting the online data transmissions to the internal gateway system; authenticating credentials of the user as a pre-authorized user; restricting a number of incoming calls using a rate-limiting throttle system; transmitting the online data transmissions to the communication management system; batching the online data transmissions into one or more micro-batches based on one or more rules; transmitting the one or more micro-batches to one or more respective backend services using an events stream system; receiving respective responses transmitted from the one or more respective backend services in response to each one of the one or more micro-batches; performing each respective task of one or more tasks based on the respective responses from the one or more respective backend services. Other embodiments are disclosed.