For the rest api it comes down to what are you hoping to get. For example to get the read string of an SNMP DeviceID of 1 it's https://netmri_ip/api/2.9/devices/DeviceCommunity?DeviceID=1 you replace th netmri_ip with your server ip address.
Great Prateek, glad you got it resolved. Please let us know if you have any additional questions? We are updating the community site in about a month with new categories, content, etc., so you'll see a dramatic change! Best, Eric