Hi @Shashwat_Chopra,
A simple way to generate coupon codes would be to convert unique id to Base 64. Like this:
This example above will give you 16-character code including uppercase (A-Z), lowercase (a-z) and numbers (0-9), but not all special characters, only “+” and “/” symbols. Like this:
It would be possible to get exactly what you want including special characters using a Repeater module (from Flow Control) and either Set Variables or Switch modules… but this would use a lot of operations. Is that something you’d like to try?