Skip Feeless Payment Pallet

This pallet allows runtimes that include it to skip payment of transaction fees for dispatchables marked by #[pallet::feeless_if](macro@ frame_support::pallet_prelude::feeless_if).

Overview

It does this by wrapping an existing SignedExtension implementation (e.g. pallet-transaction-payment) and checking if the dispatchable is feeless before applying the wrapped extension. If the dispatchable is indeed feeless, the extension is skipped and a custom event is emitted instead. Otherwise, the extension is applied as usual.

Integration

This pallet wraps an existing transaction payment pallet. This means you should both pallets in your construct_runtime macro and include this pallet's SignedExtension (SkipCheckIfFeeless) that would accept the existing one as an argument.