40101: Authentication failed

The credentials presented were not accepted, for example an API key secret that did not match, an invalid token, or no credentials supplied at all.

What you should do

Check that the client is presenting valid credentials. For Basic authentication, confirm the API key is complete and correct; for token authentication, confirm the token is valid and that any client ID configured on the client matches the one the token was issued for.

Why it happens

The credentials presented were not accepted. Causes include an API key secret that doesn't match, such as a mistyped or truncated key, an invalid or expired token, a signed token request whose MAC doesn't verify, a client ID that doesn't match the token, or no credentials at all.

What you'll see

The error is reported with code 40101 and HTTP status 401. The message gives the detail, for example Not authorized or Invalid clientId.