Thankfully some companies just send you a QR-code via email to interact with what ever system they are using. If I remember correctly one of my hotels I used s

Thankfully some companies just send you a QR-code via email to interact with what ever system they are using. If I remember correctly one of my hotels I used sent me a pin code or such via email and then they had a self service to get a keycard, which used the pin code.