It starts before any code. Support tickets with customer names, repos that coding agents read as context, contracts someone pastes in for a summary: write down what actually goes into your requests. That list decides what you move first.
The switch itself is small if you're on the OpenAI or Anthropic SDK. You change the base URL, the key and the model name. Most of the guide is about everything around it: choosing a replacement model, testing it on your own workloads and giving your DPO a precise answer about where the data goes.
If that question is already on your desk, the full guide is here: https://melious.ai/blog/switch-to-eu-ai-api
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