AI chatbot that can search the web

This workflow is designed for dynamic and intelligent conversational capabilities. It incorporates OpenAI's GPT-4o model for natural language understanding and generation. Additional tools include SerpAPI and Wikipedia for enriched, data-driven responses. The workflow is triggered manually, and utilizes a 'Window Buffer Memory' to maintain the context of the last 20 interactions for better conversational continuity. All these components are orchestrated through n8n nodes, ensuring seamless interconnectivity. To use this template, you need to be on n8n version 1.50.0 or later.

Help me set up the n8n workflow "AI chatbot that can search the web" (https://n8n.io/workflows/1959). It uses: AI Agent, OpenAI Chat Model, Simple Memory, SerpApi (Google Search), Wikipedia. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.