Our API authenticates requests using your username or API Key. If either one or both are incorrect you will get the error "Supplied authentication is invalid".
Here are a few ways you can ensure you are using the correct credentials :
Are you using the Sandbox or the live environment ? ( Please checkout this link if you are not sure what Sandbox and live environments are)
If you are on sandbox make sure your username is sandbox and that the apikey was generated from your sandbox dashboard.
If you are on the live environment make sure you are using your application username. Here's how you can view your application username:
Make sure the API Key is correct. You can try regenerating a new API Key, just follow the steps in this article.
Remember that you need to generate a separate API Key for the sandbox environment and a separate API Key for the live environment.
For further questions email firstname.lastname@example.org