fn initialize(env: soroban_sdk::Env, admin: soroban_sdk::Address)
fn verify_and_record(
env: soroban_sdk::Env,
user: soroban_sdk::Address,
credential_id: u64,
claim_type: soroban_sdk::Symbol,
proof_hash: soroban_sdk::String,
) -> bool
fn get_verification(env: soroban_sdk::Env, id: u64) -> VerificationRecord
fn get_verification_history(
env: soroban_sdk::Env,
user: soroban_sdk::Address,
) -> soroban_sdk::Vec>