Mocha API's grouped based on object you want to deal with. Below is a list describing objects and related API's, you might find useful.
There are number of API's available for you to do operation on tests in your account. Below are the ones that are available for clients and partners at the moment.
If you wish to cancel already sent invite to candidate, allow candidate to appear second attempt or so forth, below API's will help you.
If you wish to retrieve candidate test report summary, skill based scoring or in PDF format.
Ability to create new test link for same test for different purpose is very handy. Below is complete API's to manage test link life cycle.
In case you are relying on callback notification to do to further processing, below API might be helpful. It will help you in case you need to do reconciliation if something failed at Mocha or your endpoint.