Xero is a SaaS accounting software for Invoicing and more to run your business.
Xero Accounting - Invoice & Business Software
Send data into your Xero account
Choose to send your imports to Xero for creating new invoice. Automate regular imports with email or Schedule Jobs to grab CSV files or Google Sheets. Use EasyCSV to get data from systems that only output CSV files into Xero.
Xero via EasyCSV How To Guides
Use these triggers & actions with spreadsheet data
Create Sales Invoices
Create new invoices from spreadsheets with line-items
Create Accounts Payable Invoices
Create invoices for bills received