1. A computer-implemented method for integrating and implementing virtual service packages across different service virtualization tools via program instructions stored in a memory and executed by a processor, the method comprising: generating, via the processor, data for performing a search on multiple virtual service package interfaces based on a request from a service virtualization tool, the multiple virtual service package interfaces corresponding to multiple virtual service packages; fetching, via the processor, one or more virtual service package interfaces based on the search performed on the multiple virtual service package interfaces using the generated data, wherein each of the fetched virtual service package interface is assigned a selection priority value and a weight value; computing, via the processor, an execution criticality value for each of the fetched virtual service package interfaces based on the selection priority value and the weight value assigned to each of the fetched virtual service package interfaces; selecting, via the processor, a virtual service package interface with a highest execution criticality value; invoking, via the processor, the selected virtual service package interface for executing the selected virtual service package interface; and sending, via the processor, a response generated based on execution of the selected virtual service package interface to the service virtualization tool, wherein the selected virtual service package interface is integratable and implementable across different service virtualization tools.