Material
item.material defines the base Minecraft item for the voucher.
FioVoucher resolves this value through Bukkit's Material.matchMaterial(...), so the safest format is the uppercase Bukkit material enum name.
Source examples use:
PLAYER_HEADPAPERCHESTCOOKED_BEEFTRIPWIRE_HOOK
Example:
item:
material: PAPER
amount: 1
Useful notes:
- use
PLAYER_HEADwhen you want a custom textured voucher - use
PAPERfor simple vouchers - use
CHESTorTRIPWIRE_HOOKwhen the voucher theme matches the reward - use the exact enum name from the Bukkit/Spigot material list for newer Minecraft items
External reference
Use the official Spigot Javadocs as the source of truth for valid material names:
The Spigot Material page lists the enum constants accepted by Bukkit/Spigot servers. Material names can change across Minecraft versions, so check the Javadocs for the server version you target.