Each of your channels will have it's own unique QR code, which can be found in Channels > Edit (pencil icon) as seen below.
This will open the channel settings and show the QR code in Papaya's standard format as below. From here, you can either download the QR in this format, or you can download the QR by itself ("Download QR only") for this channel.
To mass download all QR codes at once, you can select "Download all" visible in the top right of the previous image.
You can either use Papaya's standard design, or - and we actually encourage this - you can create your own design for your table cards to fit your venue's style, and just put the downloaded QR into that.
For "Dine-in" channels, we do highly recommend table codes.