GetForExchange doesn't accept JSON

[Woodehh]

Hey there,

There is a problem with the GetForExchange function. The problem resides in Transaction.php and affects users that selected the option for return json.

A viable solution to the problem would be the following:

public static function getForExchange()
    {
        if (isset($_GET['order_id'])) {
            return self::get($_GET['order_id']);
        }
        if (isset($_POST['order_id'])) {
            return self::get($_POST['order_id']);
        }

        //try to see if it's json
        $input = file_get_contents('php://input');

        $json = json_decode($input,true);
        if (json_last_error() == 0)
            return self::get($json['order_id']);

        $xml = simplexml_load_string($input);
        return self::get($xml->order_id);
    }

I did not have the time to do a PR, but i wanted to let you and others know that this is an issue.

Cheers

[chris-kruining]

#64 would solve this ;)

[Woodehh]

Cheers! Good job.