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You may receive the following errors in various forms, depending on your call method/software:

ErrorNotes and Possible Resolutions
JBWEB000065: HTTP Status 500 - InfrastructureCodes-FAILED_TO_CONVERT_STRING_TO_WHOLE_NUMBERThis occurs when, for example, a value that is expected to be numerical is put in as letters. A key culprit is using the letter version of your ClientID rather than the numerical version. Contact if you are not sure what your numerical ClientID is
401 Unauthorized response: {"failed":true,"field":null,"code":"401","message":"Access Denied","loggedIn":false} or {"@class": ".ErrorModel","failed": true,"field": null,"code": "401","message": "Access Denied","loggedIn": false}This usually occurs when there is an issue with your API signature or its placement in the header. See our document API Security - Generating your Signature. If you do not know your API Key and Secret, contact
400 Bad Request "message": "Invalid ids parameter - only numbers and commas allowed; actual value passed=itemIds"This occurs when one of the changeable parameters has not be completed or has been completed incorrectly. In this case, "itemIds" should have been a numerical value reflecting the ID ref of a specific item.
422 Unprocessable Entry: { error : ["<field_name>"] }Ensure the correct substitution/query string parameter or substitution format is being used within the API URL.
Unknown Host ErrorRelated to issues with url itself - it is basically saying that the URL you went to does not exist e.g. a typo in the URL or a substitution that is not possible, for example