API key Mismatch
The API access keys you provided were missing, incorrect, or failed validation.
The keys that you provided in your API request did not match the ones stored on the client account and your request was denied. Please ensure your keys are correct and try again.
Request Not Supported
GET requests are not supported at this endpoint. You should use POST instead.
In order to provide a secure API, GET requests are not supported. Your API requests should be sent with POST. You can use PostMan to test.