Developed and delivered a feature for the breez/spark-sdk repository that enables parsing Spark invoices without signatures and supports server-side invoice generation when only the customer’s public key is available. The implementation maintained compatibility with Spark Signing Operators by preserving signature verification when signatures are present, addressing edge cases in parsing and signature handling. Coordinated closely with upstream maintainers through a pull request and validated the changes using Rust unit tests and cargo tooling. The work focused on backend development and API design, ensuring robust integration and test coverage while expanding the SDK’s flexibility for server-side invoice workflows in Rust.