Salvatore Chirieleison worked on the pagopa/cstar-securehub-infra-api-spec repository, focusing on backend and API development using YAML. During the month, he simplified the API by removing the RTP activation update operation, reducing the surface area and minimizing potential misuse. He also enhanced SRTP callback support by implementing a SEPA cancellation response endpoint, which improved integration reliability and developer velocity. Salvatore maintained clear commit traceability aligned with SRTP backlog items, supporting future audits and smoother downstream adoption. His work demonstrated a methodical approach to API design, emphasizing maintainability and clarity while leveraging his expertise in backend development and YAML specification.