Tez is one of the biggest and popular method for traaaction. Many small and middle range businesses use it for collecting bills. But if you want to make big payments then think twice about using Tez.
Many transactions got pending while making payment. Big reason behind it can be overload on server. After 3 days you can get your amout back. So, if you want to make big payment , think other than tez or I will suggest to make small payment first to confirm that everything going on well.