Commands:

/moneyvoucher <player> <amount> <min> <max>

/experiencevoucher <player> <amount> <min> <max>

Gives you a paper, when you click the paper it gives you an amount between the <min> and <max>

Gif: https://gyazo.com/3ff3214763af1fba3ae5ab7760b06c75

Gif: https://gyazo.com/6dd42655b706691bf9f53f7c6cadffe0