Single or multiple API keys for multiple APPS

Is there any recommendations from openAI on if we should single API key or multiple API keys in case of multiple applications? For example, If I have two different apps using GPT3.5, should I use two separate keys (generally recommended method) or just single one? The reason I am asking for single key because the OpenAI is looking at rate limits etc on organisation level. Any recommendations either on some documentation or personal experiences with openai?

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