[Snippet rust]
```rust
pub async fn authentication_sync_core(
```
Path: hyperswitch/crates/router/src/core/unified_authentication_service.rs :: authentication_sync_core (function, crate=router)

Negatives:
- hyperswitch/crates/hyperswitch_connectors/src/connectors/razorpay.rs :: get_auth_header
- hyperswitch/crates/hyperswitch_connectors/src/connectors/airwallex.rs :: get_headers
- hyperswitch/crates/hyperswitch_connectors/src/connectors/worldpay.rs :: build_request
- hyperswitch/crates/router/src/db/gsm.rs :: delete_gsm_rule
- hyperswitch/crates/hyperswitch_connectors/src/connectors/cybersource/transformers.rs :: try_from