Initialize: admin, fee bps, pricing (base/slope in stroops per token), and fungible token contract id.
fn init(
env: soroban_sdk::Env,
admin: soroban_sdk::Address,
fee_bps: u32,
base: i128,
slope: i128,
token_id: soroban_sdk::BytesN<32>,
)Buy tokens for XLM (stroops). Returns tokens_out (integer units). NOTE: This minimal version matches the worker ABI; on-chain XLM and token transfers are TODO.
fn buy(env: soroban_sdk::Env, buyer: soroban_sdk::Address, xlm_stroops: i128) -> i128Sell tokens for XLM; returns XLM stroops paid out (placeholder).
fn sell(
env: soroban_sdk::Env,
seller: soroban_sdk::Address,
token_amount: i128,
) -> i128