Scrap is a currency earned by finding Cards that you already own in Supply Drops. When a duplicate Card is awarded in a Supply Drop, it will be automatically turned into Scrap based on the rarity of the Card. The higher the rarity, the more Scrap is awarded.
Scrap can be used to craft Supply Drop content that is not currently owned in the Customization Menus, or to craft duplicate Character Skill Cards towards upgrading their level.
Note: Scrap cannot be purchased with real-world money.