The process status codes provide a high-level summary of the address verification process. The assessment codes that Address Verification returns include element input status, element result status, extended element result status, and element relevance values.

The assessment codes provide granular, element-level details. You can use the assessment codes to assess the following values:

Quality of the input address and result.
Probability of successful delivery to the address.
Postal relevance of address elements.
Reasons for rejection in case of address that are not valid.
Level of similarities between the input address and the result.

Apart from the status codes and assessment codes in the result, you also receive return codes that indicate the status of API functions. API function calls provide information about the status of an API call.