SLUG is the last part of your easu digital card link. For example the slug [tester] will create the link https://easu.app/tester. You can use only alphanumeric value without spaces. It can be your name or even a number of random characters.
You can change the slug at anytime but be aware that changing it, a new QR code will be created and your old one will not work. This also affects your NFC phiscal business card, NFC sticker, Wallet card as well as all existing links you have added to emails, webpages, flyers, brochures esc.
If you received a physical card or TAXI business card tag then you were given a serial number. Enter this in the SLUG field.