Your request needs to conform with the format set as per the documentation. The message field will suggest why the error might have occurred.

Please ensure you have set the x-lem-key header and that it's the correct key. This is can be obtained in the Webhooks Connections section of your dashboard. This could also be from insufficient credits on account for the service or you are not authorised to use the service, such as AML, without being approved first.

The requested verification ID does not exist, ensure it's the System ID returned from the POST Webhook or that from the verification detail section.

The formatting or type of field sent does not conform to the documentation. The message field will suggest which field(s) are incorrect.

The LEM Server has encountered an error. Please contact [email protected] with the supplied error code.