The Borderlands VIP program allows you to collect points and get in-game rewards for all of the Borderlands games, including the upcoming Borderlands 3. One method for getting points is to find codes and redeem them at this website. These come from four different sources; e-mails, creators, vault or Diamond. However, the codes are generic, so you don't actually have to watch streamers to find their code, it's good enough to just find it in a spreadsheet and enter it.
The easiest way to find all the codes is to go to the Borderlands 3 subreddit and look for the sticked post. (Or just click here to go directly to the post). This post is updated whenever a new set of codes are released, so you will always stay up-to-date with the newest codes, and will be able to get a lot of points to spend on weapons, skins or Golden Keys.
The codes stop working after a certain set of time, most often around 48 hours, so you should check back pretty often if you want to get all the Borderlands VIP program rewards. We don't know exactly when a new set of codes are released, so just check back every few days or so.