Credentials are soulbound — they can never move between wallets. Always rejects, on purpose: this is what makes a credential prove this specific player earned it, instead of just being a tradeable badge someone else could buy.
fn transfer(
env: soroban_sdk::Env,
from: soroban_sdk::Address,
to: soroban_sdk::Address,
id: soroban_sdk::BytesN<32>,
) -> ResultRegister the deployer as admin (call once after deploy).
fn init_admin(env: soroban_sdk::Env, admin: soroban_sdk::Address)Return all credentials earned by a player, most recent last.
fn get_credentials(
env: soroban_sdk::Env,
player: soroban_sdk::Address,
) -> soroban_sdk::VecIssue a soulbound credential to a player for completing subject at
cefr_level with score (0-100). Admin-only: in this MVP the admin
acts as the trusted issuer on behalf of WordScrambleContract, since
the two contracts aren't wired together yet. Panics if score is below
the pass threshold, so a credential can never be issued for a failing
or borderline result.
fn issue_credential(
env: soroban_sdk::Env,
admin: soroban_sdk::Address,
player: soroban_sdk::Address,
subject: soroban_sdk::Symbol,
cefr_level: soroban_sdk::Symbol,
score: u32,
) -> soroban_sdk::BytesN<32>Publicly verify a single credential by ID. Anyone can call this via the public RPC without needing to trust the issuing platform.
fn verify_credential(
env: soroban_sdk::Env,
credential_id: soroban_sdk::BytesN<32>,
) -> Result