curl https://api.deepseek.com/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <sk-cb27c81768e443868a194fad0bb91abc>" \
  -d "{
        \"model\": \"deepseek-chat\",
        \"messages\": [
          {\"role\": \"system\", \"content\": \"You are a helpful assistant.\"},
          {\"role\": \"user\", \"content\": \"Hello!\"}
        ],
        \"stream\": false
      }"