find out how to add api key and secret key in header

'methodology' => 'POST',
    'timeout' => 45,
    'redirection' => 5,
    'httpversion' => '1.0',
    'blocking' => true,
    'headers' => array(
         'Content material-Kind' => 'software/json',
         'Authorization' =>  '',
         'X-LLM-market' => 'PH_MNL’