Shady business and subscriptions
The way they conduct their business seems entirely shady, I would stay far, far away. I used them to generate a QR code for a conference booklet not realizing that it would expire and force payment within one week (which admittedly is on me, and I should have read the fine print - no matter how much they try to hide it initially). Once the QR code expired (one day before the conference), I realized I would have to unfortunately sign up for a paid membership to save myself the panic and stress of navigating fixing all the conference materials. However, they advertise it as a monthly membership, but charge it annually (though they try to make that as hidden as possible until the charge goes through). And then, they refuse to refund folks who realize right after what has happened with the annual membership. Shady, unhelpful, and very untrustworthy.
Please save yourself the headache and stress (and your money) and go anywhere else. There are so many free ways to generate QR codes, and I wish I would have done my research thoroughly beforehand. And if you do want to pay, I can guarantee ANY business would be better to give your money to.