An application programing interface key (API key) is a code generated by websites that allow users to access their application programming interface. API keys are used to track how the API is being used in order to prevent malicious use or abuse of the terms of service, etc. API keys are based on the UUID system to ensure they will be unique to each user.
To set up API Key, go to: Communities >> Modules >> Mobile
To generate the API key:
This feature is available with the following license :