Currently Salesforce Marketing Cloud not supports QR Code hence I have created custom SSJS code using the Google QR API. Please find below same.
Most of the time business wants to use custom profile center instead of vanilla or out of box profile center. Without profile center and physical Email Address you cannot send email. To overcome this scenario you need to add profile center and physical Email Address in Email and hide it using Ampscript.
Most scenarios, it needs to be fetch the data from DE. You can achieve this using SSJS or AMPScript in Salesforce Marketing Cloud.
In Salesforce Marketing Cloud, most of the time we need to retrieve the Publication Lists associated to the Subscriber. Please find below SSJS code snippet for same. UI FORM SECTION PROCESSING PAGE SECTION :
In Salesforce Marketing Cloud, How to display List details using SSJS in cloud page.