set_credential_name
Description:
Sets the credential name used to pass the stored or gathered credential (like password) into the invoke_authenticate.
This is a counterpart of the authentication method. The null means to use the default name, which is
SOURCE_CREDENTIAL_PASSWORD.
The internal copy of credential_name is automatically stripped of leading and trailing whitespace. If the resulting string is
empty, null is set instead.
Parameters:
| this | |
| credential_name |
a credential name, or |