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

Negatives:
- hyperswitch/crates/router/src/core/tokenization.rs :: get_token_vault_core
- hyperswitch/crates/hyperswitch_connectors/src/connectors/hipay.rs :: get_headers
- hyperswitch/crates/hyperswitch_connectors/src/connectors/gpayments.rs :: get_content_type
- hyperswitch/crates/storage_impl/src/payments/payment_attempt.rs :: find_payment_attempts_by_payment_intent_id
- hyperswitch/crates/hyperswitch_connectors/src/connectors/fiserv.rs :: get_url