NahamStore is a vulnerable e-commerce store and infrastructure which is used to test your skills once you've been through NahamSec's "Intro to Bug Bounty Hunting and Web Application Hacking" udemy course which can be found here:
https://www.udemy.com/course/intro-to-bug-bounty-by-nahamsec/
If you use any automation tools please only use the dictionary / SecLists found here to avoid wasting your time.