Never trust a company that has no telephone number or email address. There so called FREE Static QR code suddenly stopped work with an error message. Turns out the code is NOT free but part of a 14 day trial. Something NOT mentioned in their actual webpage https://www.qr-code-generator.com/.
And with absolutely no way of contacting them, I was left with no other choice but to throw away all my business cards, pamphlets and other company stationaries and redo them another company.
I hope everyone avoids this company!