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Choosing the wrong integration method on an Oracle Fusion project is one of the most common mistakes that causes performance issues, failed migrations, and unnecessary rework. HDL, FBDI, and REST APIs are not interchangeable — each is designed for a specific volume, module, and latency requirement. Most guides stop at three tools. This one covers four, including HSDL, which is missing from most comparison articles but used in almost every HCM implementation for post go-live operations. The decision framework comes down to two questions: what module are you loading into, and how much data are you moving at once?