Self check-in options on the market

Hi,

I'm wondering if anyone has come across a good option for self check-ins, what we are looking for it's a solution that integrates with a PMS system like Cloudbeds for example, Where once a guest makes a booking will receive a code to get in the main gate of the building and also the code to get in their room without the help of a human.

We are looking for a company/brand providing the physical locks that work with electronic codes, QR codes whatever it might be that integrates with the booking system so once the guest makes a booking receives all the credentials to get inside his room.

Does anyone have any experience or suggestions? We are looking for Spain and Portugal.

Regards, Fabio