[Snippet rust]
```rust
fn get_metadata(&self) -> Result<Option<serde_json::Value>, Error>;
```
Path: hyperswitch/crates/hyperswitch_connectors/src/connectors/shift4/transformers.rs :: get_metadata (function, crate=hyperswitch_connectors)

Negatives:
- hyperswitch/crates/hyperswitch_connectors/src/connectors/redsys.rs :: get_error_response
- hyperswitch/crates/hyperswitch_domain_models/src/revenue_recovery.rs :: from
- hyperswitch/crates/hyperswitch_connectors/src/connectors/facilitapay/transformers.rs :: try_from
- hyperswitch/crates/hyperswitch_domain_models/src/bulk_tokenization.rs :: foreign_from
- hyperswitch/crates/hyperswitch_connectors/src/connectors/signifyd.rs :: handle_response