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When integrating exchange rate data, an exchange rate API key acts as a unique identifier to ensure secure access and personalized services. Most providers require an API key to authenticate requests, which helps maintain data accuracy and prevents unauthorized usage. Developers can often generate their API key during registration, allowing them to track usage and access additional features like rate limits and premium data options. Protect your API key by keeping it secure in environment variables or encrypted storage. By managing your key effectively, you ensure consistent and reliable currency data for your application.

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