| Network APIs remain largely unfamiliar to the application development community, which results in limited commercialization of exposed mobile network capabilities despite the significant progress achieved in recent standardization efforts. Recent 3GPP releases and open industry initiatives such as CAMARA aim to simplify the exposure and consumption of network functionalities through standardized and developerfriendly interfaces. However, the lack of a trusted execution and validation environment still prevents application developers from efficiently testing, validating, and refining innovative service concepts. This paper proposes a Trusted Application Function that bridges the gap between programmable network exposure and practical application experimentation. The solution provides controlled access to CAMARA-aligned Network APIs, integrates authorization and policy enforcement, and enables end-to-end validation within a real testbed environment. The approach is validated through healthcare and automotive traffic-influence scenarios, demonstrating measurable improvements in latency, prioritization, and service reliability. The results underline the importance of trusted middleware for accelerating Network API adoption toward 6G programmable and intent-driven networks. |
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