Query balance for a single address (helper function)
fn check_balance(
env: soroban_sdk::Env,
usdc_token: soroban_sdk::Address,
address: soroban_sdk::Address,
) -> i128
Query USDC balances for multiple addresses
usdc_token - USDC token contract addressaddresses - Array of addresses to check (max 100)Array of balances in the same order as input addresses
fn check_balances(
env: soroban_sdk::Env,
usdc_token: soroban_sdk::Address,
addresses: soroban_sdk::Vec,
) -> soroban_sdk::Vec