curl_setopt_array($curl, array(
CURLOPT_URL => 'https://<domain>/<api prefix>/<version>/user/internal-wallet/transfer/',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_POSTFIELDS => array('source_wallet' => '<source_wallet>','destination_wallet' => '<destination_wallet>','transfer_amount' => '<transfer_amount>','form_key' => '<form_key>','token_checksum_field' => '<token_checksum>','token_field' => '<token>'),
CURLOPT_HTTPHEADER => array(
'Authorization: Bearer <access token>',
$response = curl_exec($curl);