Ngz developed a CDN Token Validity API enhancement for the fal-ai/fal repository, focusing on secure and flexible token management. The solution introduced a new 'valid_for' parameter, allowing API callers to specify token lifetimes using either integer seconds or Python timedelta objects. By setting a default validity interval of one hour, Ngz balanced usability with improved security, reducing the risk of token misuse. The work demonstrated practical backend development and API design skills in Python, establishing a standardized approach to managing CDN token lifecycles. Over the month, Ngz delivered one feature with depth, addressing a clear security and usability need.