Minetest QR Code
Usage:
Use /qrcode <message> and it will make a QR Code into the positive x and positive Z directions
Installing mod:
Download from source: https://edugit.org/Miniontoby/minetest-qrcode.git Or use ContentDB: https://content.minetest.net/packages/Miniontoby/qrcode
If you minetest gives an error for the function: dofile('qrencode.lua') or something like that
Then add qrcode to secure.trusted_mods in your minetest.conf and you are good to go