Integrate into LangChain

1. Directly set the environment variable, the code is as follows

 API_SECRET_KEY = "sk-xxx" #302.AI Backend-Use API-API Keys generated API KEY
BASE_URL = "https://api.302.ai/v1/chat/completions";  #302.AI's base-url

os.environ["OPENAI_API_KEY"] = API_SECRET_KEY
os.environ["OPENAI_BASE_URL"] = BASE_URL

2. Call in the code

 from langchain_openai import ChatOpenAI,OpenAI
llm = OpenAI(model_name='gpt-4o-mini', 
openai_api_key='sk-xxxx',  #302.AI Backend-Use API-API Keys generated API KEY
openai_api_base='https://api.302.ai/v1/chat/completions',) #302.AI's base-url