This error message pops up when the Authorize.Net Login ID and Transaction Key you have configured with Chargebee are no longer valid.
Info: The API Login ID and Transaction Key (unique to your Chargebee account) let Authorize.Net recognize Chargebee as a trusted application and surrender transaction information to it.
To fix this and update the credentials, Go to Chargebee Dashboard,
> Configure Chargebee
> Payment Gateway
> Select Configure this gateway on Chargebee.
If you don’t remember your Transaction Key, you can generate a new one in your Authorize.Net account from Account > Settings > Login ID and Transaction Key.
Warning: Authorize.Net may disable old API keys when the Disable Old Transaction Key(s) option is left unchecked. To avoid errors, use your new transaction key after it is generated. Click here to know more about this.