Get all available users.
Best practise is to cache this information and reload the availableUsers periodically (for example: once a day).
apiKey + environment
|apiKey||String||Your public apiKey needs to be included in every request.|
|environment||Enum||"test" or "production"|
|HMACKey||String||The HMACKey is calculated based on the input fields.|
|success||Boolean||Indicates if the request was successfully executed.|
Array with the available users