lib/Configuration.php
public function getApiKeyPrefix($apiKeyIdentifier)
    {
        return isset($this->apiKeyPrefixes[$apiKeyIdentifier]) ? $this->apiKeyPrefixes[$apiKeyIdentifier] : null;
    }
public function getApiKeyPrefix($apiKeyIdentifier)
    {
        return isset($this->apiKeyPrefixes[$apiKeyIdentifier]) ? $this->apiKeyPrefixes[$apiKeyIdentifier] : null;
    }
public function getApiKeyPrefix ( $ apiKeyIdentifier ) { return isset ( $ this -> apiKeyPrefixes [ $ apiKeyIdentifier ] ) ? $ this -> apiKeyPrefixes [ $ apiKeyIdentifier ] : null ; }
Gets API key prefix

@param string $apiKeyIdentifier API key identifier (authentication scheme)

@return string
Gets API key prefix