Merchant ID
    internet
    wgH8RjewQ16gIWJ5bqQKGA
    1001
    14609958221624162
    12345
    
        Un elemento devuelto
        Número de seguimiento 18849
    
    fb528c20a04fb494f796591392ede2d36140b471
    946435842f5602b9db2a78c1fc983e2960b79c13


// Creando el hash

$tmp = "$timestamp.$merchantid.$orderid.$amount.$currency.$cardnumber";
$sha1hash = sha1($tmp);
$tmp = "$sha1hash.$secret";
$sha1hash = sha1($tmp);