Invoice Processor & Validator with OCR, AI & Google Sheets

📝 Say goodbye to manual invoice checking! This smart workflow automates your entire invoice processing pipeline using AI, OCR, and Google Sheets. ⚙️ What This Workflow Does: 📥 1. Reads an invoice PDF — Select a local PDF invoice from your machine. 🔍 2. Extracts raw text using OCR — Converts scanned or digital PDFs into readable text. 🧠 3. AI Agent processes the text — Transforms messy raw text into clean JSON using natural language understanding. 🧱 4. Structures and refines the JSON — Converts AI output into a structured, usable format. 🔄 5. Splits item-wise data — Extracts individual invoice line items with all details. 🆔 6. Generates unique keys — Creates a unique identifier for eac

Help me set up the n8n workflow "Invoice Processor & Validator with OCR, AI & Google Sheets" (https://n8n.io/workflows/4247). It uses: Google Sheets, Code, AI Agent, OpenRouter Chat Model. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.