Gurpreet Singh contributed to the UnionInternationalCheminsdeFer/OSDM repository by designing and specifying two key API features over a two-month period. He enhanced the OSDM API using YAML, focusing on schema definition and API design to improve the integration between reservations and ancillary services within offers. His work included adding a reservations link to ancillary objects, enabling direct association of reservation details, and introducing an AncillarySubType schema for more granular categorization. These changes improved data traceability, analytics, and downstream integration capabilities. Gurpreet’s contributions demonstrated depth in API specification and laid a foundation for future enhancements in offer logic and partner onboarding.