A value that is associated with the token retrieval request. SecretID is defined by the application, and is passed in redirect URL to the eBay signin page. eBay recommends using a UUID for the secret ID value. You must also set Username (part of the RequesterCredentials) for the particular user of interest. SecretID and Username are not required if SessionID is present.
See the
Field Index to learn which calls use SecretID.