Implementing OpenAI Python SDK on simplerLLM

Sir, I want to implement OpenAI Python SDK to simplerLLM. Its a open source model which provides API. They provides OpenAI Python SDK which I shared below & its working fine to other project but now want to use it with simplesLLM. I added it in the main Python file & got "errorMessage": "The api_key client option must be set either by passing api_key to the client or by setting the OPENAI_API_KEY environment variable",
"errorType": "OpenAIError",

import openai

client = openai.OpenAI(
    base_url = "https://api.endpoints.com/v1",
    api_key = "esecret_YOUR_API_KEY"
)

chat_completion = client.chat.completions.create(
    model="model-name-chat",
    messages=[{"role": "system", "content": "You are a helpful assistant."}, 
              {"role": "user", "content": "Say 'Test'."}],
    temperature=0.7
)