GST E-Invoice & E-Way Bill Automation for Shopify via GSP

Automate GST e-Invoice & e-Way Bill creation for Shopify orders—powered by your GSP API

This n8n workflow automatically generates GST e-Invoice details (IRN/QR) and/or e-Way Bill for every Shopify order marked as paid, renders a compliant PDF, archives it to Google Drive, emails the invoice via Gmail, and logs everything to Google Sheets—while routing failures to Slack.

What this workflow does

• Triggers on payment: Starts when a Shopify order is marked paid.
• Calculates GST & compliance routing: Loads seller configuration plus HSN and prior status from Google Sheets, then determines whether the order needs an IRN, an e-way bill, or no compliance document.
• Creates or fetches IRN/e-way via GSP: If required, authenticates with your GSP and calls the relevant GSP API—fetching an existing IRN when the portal reports it was already generated.
• Parses compliance response: Extracts IRN, acknowledgment details, signed QR data, and e-way bill information; posts errors to Slack if creation fails.
• Generates invoice PDF: Builds an HTML tax invoice (including a QR code via quickchart.io when available) and renders it to PDF using a Gotenberg server.
• Updates records &amp> customer delivery: Saves the PDF to Google Drive, emails it to the customer via Gmail, writes IRN/e-way/invoice details back to the Shopify order as metafields and a tag, and upserts the transaction into the Google Sheets GST Register.
• Supports IRN cancellation: Accepts IRN cancellation requests via an n8n form, validates the 24-hour cancellation window against the GST Register, cancels through the GSP API when allowed, and reports results to Slack.

Use cases

• Shopify sellers who need GST e-invoice automation with IRN/QR and automated PDF delivery.
• Businesses shipping orders that require e-way bill generation based on GST compliance rules.
• Automation engineers and SaaS operators managing invoice issuance, archiving, and audit logs in Google Sheets.

Technical details

• Trigger: Shopify order marked as paid
• Data & logging: Google Sheets (GST register), Google Drive (PDF archive)
• Email: Gmail (send PDF to customer)
• Failure handling: Slack (error posting)
• PDF rendering: Gotenberg
• QR generation: quickchart.io (when available)
• Workflow nodes mentioned: if, code, gmail, slack, switch, sticky note