n8n Excel Merge Workflow

I have two—or possibly more—Excel files that hold sales data. I need an n8n workflow that pulls each file in, merges all the rows, and then matches everything by customer ID so the final, consolidated result is ready for analysis or export.

Here’s what success looks like to me:
• A reusable n8n workflow (exported JSON) that watches or loads multiple Excel files, cleans simple inconsistencies if necessary, and joins the tables on the customer-ID column.
• A clear final node—Google Sheet, new XLSX, or a simple JSON output—that shows the merged dataset so I can download or keep processing it.
• Brief setup notes so I can swap in new Excel files and run the flow myself.

I’m comfortable if you use standard n8n nodes (Spreadsheet File, Merge, Set, etc.) or community extras; just keep everything native enough that future updates are easy. I’d like the finished workflow and instructions delivered within a month.