Hey there @Vinod_Hum,
We've got some great resources you should check out:
- http://wiki.dreamfactory.com/DreamFactory/Tutorials/Server_Side_Scripting - the push notification and sql + nosql both make api calls from within the script
- http://wiki.dreamfactory.com/DreamFactory/Features/Scripting#Resources_Available_To_A_Script - resources available to a script/ the platform resource
Between these two resources, you should be able to get the full picture. 
Thanks,
@AlexBowen