Credits are automatically applied. Balance can be manually applied during checkout.

Credits
When you make a purchase, any available Mercari Credits are automatically applied up to the purchase price. Leftover Credits will remain in your account for use toward your next purchase.

You can view your available Credits and their expiration dates under Settings > Credits. Once a credit has expired, it cannot be reissued.

Balance
To apply your balance:
From the checkout screen, tap “Apply”
Enter the amount of balance you’d like to apply and tap “Apply” again to update your total