Function encode_gat_struct 

pub fn encode_gat_struct(d: &GatData) -> Vec<u8> 

ABI-encode a GatData struct into the staticInput bytes expected by the on-chain GoodAfterTime handler.

Encoding layout (each word is 32 bytes, big-endian):

• Words 0-11: GpV2OrderStruct fields (sell_token, buy_token, receiver, sell_amount, buy_amount, valid_to, app_data, fee_amount, kind, partially_fillable, sell_token_balance, buy_token_balance)
• Word 12: start_time (uint32)
• Word 13: tx_deadline (uint32)

Total: 14 × 32 = 448 bytes.

use alloy_primitives::{Address, B256, U256};
use cow_composable::{GatData, GpV2OrderStruct, encode_gat_struct};

let order = GpV2OrderStruct {
    sell_token: Address::ZERO,
    buy_token: Address::ZERO,
    receiver: Address::ZERO,
    sell_amount: U256::from(1_000u64),
    buy_amount: U256::from(900u64),
    valid_to: 9_999_999,
    app_data: B256::ZERO,
    fee_amount: U256::ZERO,
    kind: B256::ZERO,
    partially_fillable: false,
    sell_token_balance: B256::ZERO,
    buy_token_balance: B256::ZERO,
};
let data = GatData { order, start_time: 1_000_000, tx_deadline: 2_000_000 };
let encoded = encode_gat_struct(&data);
assert_eq!(encoded.len(), 448);