fn initialize(env: soroban_sdk::Env, admin: soroban_sdk::Address)
fn revoke(
env: soroban_sdk::Env,
credential_id: u64,
issuer: soroban_sdk::Address,
reason: soroban_sdk::Symbol,
)
fn is_revoked(env: soroban_sdk::Env, credential_id: u64) -> bool
fn get_revocation_record(env: soroban_sdk::Env, credential_id: u64) -> RevocationRecord
fn get_revocation_list(
env: soroban_sdk::Env,
issuer: soroban_sdk::Address,
) -> soroban_sdk::Vec