get https://api.fountain.com/v2/applicants//labels
This lists all labels for an applicant.
This way you can perform a quick check to see if the applicant has one label or another.
You can assign them a new label or remove an existing one using the corresponding API methods PUT request
NOTE: URL Encoding Matters!
The label names that you use in other methods must be URL encoded, e.g. 'New%20label' and not 'New label'.