API sandbox for testing purposes

I’ve authored a Monzo API client in Rust - GitHub - danieleades/monzo-lib: monzo API client library, in pure rust

it works, but short of spamming my own account with trivial transactions, I have no means of performing integration tests against the API.

It would be really useful for third-party developers to have a sandbox/dummy API they could communicate with in order to run tests (either locally or in CI).

This would just return dummy data, representative of real data.