How to Verify PDF Invoice Attachments in WooCommerce Emails

# How to Verify PDF Invoice Attachments in WooCommerce Emails An order note saying "invoice sent" does not prove that the customer email contained a readable PDF. Treat document generation, filesystem access, email creation, and attachment metadata as separate checkpoints. ## Identify the required document Start with the WooCommerce event and email class. Decide whether the workflow requires an invoice, packing slip, quote, or credit note. Confirm the document plugin is configured to attach that document to the selected email type. ## Generate the file through the real workflow Create or update a disposable order through the normal WooCommerce screens. Use the PDF plugin's own settings and order actions. Avoid a hand-made fixture file: it proves only that PHP can see a PDF, not that the production integration attached one. ## Inspect the attempt Verify the mail attempt includes an attachment count greater than zero, a safe filename, a PDF MIME or extension consistent with the integration, and a successful send result. Do not upload the document body or customer details to hosted monitoring. ## Check negative cases Temporarily disable the attachment rule on the disposable store and repeat the event. The missing-PDF warning should appear. Restore the rule, repeat once, and confirm the warning clears without creating a duplicate customer email. Use the finding as a deploy blocker when a marketed invoice workflow has no attachment, when the file cannot be generated, or when the diagnostic surface leaks the document or recipient. [Review Mail Guard OS](https://vamaolabs.com/products/vamao-mail-guard-os) or use the [Mail Guard operating guide](https://vamaolabs.com/docs/vamao-mail-guard-os/how-to-install-and-operate).