The best thing is that it's cheap for your business! For example we are building an online shop website where you can buy tickets to events around Belgium through our platform (using their API). There was no way of doing this with other providers than paying big money in advance or using premium features which I didn't want because those were too expensive for my budget at first plan level. After searching far & wide I found register be who had just what i needed - A low price but still offering all bells n whistles aswell as more functionality then others out there.