If you run a Shopify store in Greece, you already know the drill: a customer checks out, and someone has to turn that order into a receipt or invoice, get it to myDATA, and email it to the buyer. Multiply that by every order, every day.

This guide explains how a Shopify–myDATA integration actually works, why it matters for OSS/VAT compliance if you sell across the EU, and what to look for in a service that does it for you — without a developer and without a crash course in Greek tax law.

Why Shopify sellers in Greece need a myDATA connection

Since the AADE (Independent Authority for Public Revenue) rolled out myDATA, every business issuing receipts or invoices in Greece needs those documents transmitted electronically. For a physical store, that's manageable. For a Shopify store processing dozens or hundreds of orders a day — often to customers in different EU countries with different VAT rates — doing it manually isn't realistic.

That's where a Shopify myDATA integration comes in: it listens for new orders on your store and automatically generates and transmits the correct document type, without you touching a spreadsheet.

How the integration works

The connection runs on Shopify Webhooks. In plain terms:

• A customer completes checkout on your Shopify store.
• The order is marked as fulfilled.
• A webhook instantly notifies Workadu.
• The platform generates the correct document — receipt or invoice — using pre-set document types, so you never configure accounting rules manually.
• The document is transmitted to myDATA, directly or through a certified e-invoicing provider.
• A copy is emailed straight to your customer.

No plugin needs to live inside your Shopify admin, and there's no manual export/import step. It runs quietly in the background.

Built-in OSS/MOSS support

If your Shopify store ships to customers across the EU, you're likely dealing with the One Stop Shop (OSS) scheme, which requires you to charge and report VAT based on the customer's country, not just Greece's rate. A good integration handles this automatically:

• VAT is calculated per destination country at invoice stage, matching OSS/MOSS rules.
• Foreign currency is converted automatically, using the official European Central Bank exchange rate.
• A consolidated VAT report by country is generated for your OSS filing, so your accountant isn't reconciling Shopify exports by hand every quarter.

What you get

• Automatic invoice/receipt issuance and transmission to myDATA or a certified e-invoicing provider
• Auto-filled documents: line items, customer details, VAT, VAT exemptions
• Emailing to the customer, automatically
• OSS/MOSS-compliant VAT handling per country
• Currency conversion using ECB rates
• A sandbox environment to test the whole flow before it touches real documents
• Free setup via an online session with a technician — no developer required
• Free 30-minute platform training
• Real-time chat support, Monday–Friday, 09:00–17:00

Frequently asked questions