I used Google apps script to make a full invoicing automation system with Zoho CRM, Zoho Invoice, Google Drive, Google's Spreadsheet-to-PDF tool, and Google Clo

I used Google apps script to make a full invoicing automation system with Zoho CRM, Zoho Invoice, Google Drive, Google's Spreadsheet-to-PDF tool, and Google Cloud Print. There were a bunch of gotchas in terms of the 6-minute runtime, the available runtime per day, and the script just getting killed randomly. I managed to work around them all after a lot of hair-pulling... We ran ~15k invoices through it last year!