The formation procedure of the hash

The order of forming an md5 string consists in concatenating (connecting) the query parameters with a password, converting the resulting string in lower case to md5. The order of the parameters is as follows: rate, term, server_id, partner_code, password_api. Some code may be missing, but the order must be followed.

PHP example:

?php
$rate = “singapore”;
$term = 1;
$partner_code = “14321”;
$password_api = “sdsd4223dsd”;

$string = $rate . $term . $partner_code . $password_api;
$md5_hash = md5(mb_strtolower($string));