Worked on the holidayextras/partner-api-docs repository to enhance booking API functionality by introducing an optional customerRef parameter for both Fast Track and Lounge booking endpoints. This addition enabled the use of unique reference codes for customer bookings, improving integration accuracy and traceability for API consumers. The work involved updating API documentation written in Markdown to clearly describe the new parameter and its usage, ensuring developers could easily adopt the change. Additionally, corrected a release date entry in the changelog to maintain accurate project records. Demonstrated skills in API documentation and technical writing, focusing on clarity and precision throughout the process.