Extract and Organize Colombian Invoices with Gmail, GPT-4o & Google Workspace

🧾 Personal Invoice Processor This N8N workflow automates the extraction and organization of personal invoices in Colombia received via Gmail. It includes the following key steps: 🔁 Flow Summary Email Trigger Polls Gmail every 30 minutes for emails with .zip attachments (assumed to contain invoices). Expects ZIP file following DIAN standards. ZIP File Handling Extracts all files. Filters only PDF and XML files for processing. Data Extraction & Processing Uses LangChain Agent + OpenAI (GPT-4o-mini) to extract: Tipo de documento (Factura / Nota Crédito) Número de factura Fecha de emisión (YYYY-MM-DD) NIT emisor y receptor (sin dígito de verificación) Razón social del emisor Subtotal, IVA, Tot

Help me set up the n8n workflow "Extract and Organize Colombian Invoices with Gmail, GPT-4o & Google Workspace" (https://n8n.io/workflows/3951). It uses: Google Sheets, Google Drive, Compression, Code, AI Agent, OpenAI Chat Model, Structured Output Parser, Calculator. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.