Credit Coupons buy you meals, let you skip work, and even let you sleep in late in the story. You'll need to get your hands on them in bulk eventually, so here's how you can.
How to earn Credit Coupons in Genshin Impact
As a currency, Credit Coupons are only of any real value while you're within the Fortress of Meropide. The best way to earn them is by opening Fortress of Meropide treasure chests and completing Scenes from Life in Meropide quests. Both these things are located all over the prison fortress, so there's plenty to do while you're down there.
(Note that the chests and the quests are mostly unlocked after you complete the Fortress of Meorpide storyline.)
Related: How to solve Evermotion Mechanical Painting Sumeru I in Genshin Impact
Where to use Credit Coupons in Genshin Impact?
Credit Coupons can be used in two ways inside the Fortress of Meropide. The first way was focused on heavily during the 4.1 storyline. Bringing Credit Coupons to the Cafeteria allows you to exchange for high-quality food items in addition to the free Welfare Meal, as mentioned in the main story. The more Credit Coupons you have, the better food items you can get, so make sure to have a bunch with you.
Additionally, you can also bring them to the Rag and Bone Shop to purchase a variety of useful goods, including some items that will help you win the Pankration Ring. As you are not really a prisoner anymore by this point, you can freely go to the Fortress of Meropide and participate in earning Credit Coupons freely without the restrictions played on you during the story.
For more help with Genshin Impact, take a look at Genshin Impact Codes – Livestream Codes! and Genshin Impact Unfinished Task Hidden Quest guide – Scenes from Life in Meropide here at Pro Game Guides.