# Pallet Performance - w/ChatGPT

write me code for a substrate pallet with business logic that links treasury spending to new identity creation, each new identity enables a recurring payment

use frame_support::{decl_module, decl_storage, decl_event, ensure};
use frame_system::{self as system, ensure_signed};
use sp_std::vec::Vec;

#[derive(Debug, PartialEq, Eq)]
pub struct Identity<AccountId> {
    account: AccountId,
    recurring_payment: u64,
}

#[derive(Debug)]
pub enum Error {
    NotEnoughFunds,
}

decl_storage! {
    trait Store for Module<T: Trait> as MyModule {
        pub Identities get(fn identities): Vec<Identity<T::AccountId>>;
    }
}

decl_event!(
    pub enum Event<T>
    where
        <T as frame_system::Trait>::AccountId,
    {
        IdentityCreated(AccountId),
        RecurringPaymentEnabled(AccountId, u64),
    }
);

decl_module! {
    pub struct Module<T: Trait> for enum Call where origin: T::Origin {
        #[weight = 0]
        fn create_identity(origin) {
            let sender = ensure_signed(origin)?;

            let mut identities = Self::identities();
            identities.push(Identity {
                account: sender.clone(),
                recurring_payment: 0,
            });

            Self::deposit_event(RawEvent::IdentityCreated(sender));
        }

        #[weight = 0]
        fn enable_recurring_payment(origin, amount: u64) {
            let sender = ensure_signed(origin)?;

            ensure!(
                T::Currency::free_balance(&sender) >= amount,
                Error::NotEnoughFunds
            );

            let mut identities = Self::identities();
            let mut identity = identities.iter_mut().find(|i| i.account == sender).unwrap();
            identity.recurring_payment = amount;

            T::Currency::transfer(&sender, &Self::treasury_account(), amount)?;

            Self::deposit_event(RawEvent::RecurringPaymentEnabled(sender, amount));
        }
    }
}

pub trait Trait: frame_system::Trait {
    type Event: From<Event<Self>> + Into<<Self as frame_system::Trait>::Event>;
    type Currency: Currency<Self::AccountId>;
    fn treasury_account() -> Self::AccountId;
}

pub trait Currency<AccountId> {
    fn transfer(
        from: &AccountId,
        to: &AccountId,
        value: u64,
    ) -> Result<(), Error>;
    fn free_balance(who: &AccountId) -> u64;
}

impl<T: Trait> Currency<T::AccountId> for T::Currency {
    fn transfer(
        from: &T::AccountId,
        to: &T::AccountId,
        value: u64,
    ) -> Result<(), Error> {
        let balance = T::Currency::free_balance(from);

        ensure!(balance >= value, Error::NotEnoughFunds);

        T::Currency::transfer(from, to, value)?;

        Ok(())
    }

    fn free_balance(who: &T::AccountId) -> u64 {
        T::Currency::free_balance(who)
    }
}

In this example, the pallet defines a struct Identity that includes the account ID of the identity and the recurring payment amount. The pallet provides two functions: create_identity and enable_recurring_payment.

The create_identity function creates a new identity and adds it to the Identities storage vector. The enable_recurring_payment function enables the recurring payment for an identity by transferring the specified amount of tokens from the treasury account to the identity's account.

To use this pallet, you would need to define the Trait and Currency traits, and provide implementations for treasury_account, Currency::transfer,