In lightninglabs/loop/pull/445, I bumped the following dependencies by mistake:

google.golang.org/grpc v1.38.0 -> google.golang.org/grpc v1.42.0
google.golang.org/protobuf v1.26.0 -> google.golang.org/protobuf v1.27.1

This caused all paywalled aperture apis to fail with rpc error: code = Unknown desc = cannot initiate swap: unexpected HTTP status code received from server: 402 (Payment Required), despite the interceptor being active (confirmed with ad-hoc logging).

This is not an issue at present, since we have no pressing need to upgrade.
Should we decide to upgrade lnd/loop/pool/lit, we will need to remember to upgrade aperture as well.