pub trait FeeHandler<T: pallet::Config> {
	/// Get the amount of fee to charge user
	fn get_fee_amount(
		from: &T::AccountId,
		to: &T::AccountId,
		detail: &PaymentDetail<T>,
		remark: Option<&[u8]>,
	) -> BalanceOf<T>;

	/// Deduct the fee from the user transaction
	fn apply_fees(from: &T::AccountId, to: &T::AccountId, detail: &PaymentDetail<T>) -> DispatchResult;
}

	fn apply_fees(from: &AccountId, _to: &AccountId, detail: &PaymentDetail<Test>) -> DispatchResult {
		// transfer the fee amount to fee recipient account
		<Tokens as MultiCurrency<AccountId>>::transfer(
			detail.asset,
			from,                   // fee is paid by payment creator
			&FEE_RECIPIENT_ACCOUNT, // account of fee recipient
			detail.fee_amount,      // amount of fee
		)
	}