WooCommerce PDF Invoice plugins (Webtoffee, WP Overnight, Bookworm, and others) typically store invoice metadata as order postmeta: the invoice number, generated date, sequential format, and a path or attachment ID for the PDF. Some plugins keep the document on disk and re-generate on demand, others store it as a media attachment. SleekAI reads the order plus the relevant postmeta via the data-source wizard, so the system message can include each customer's invoices alongside their orders.

That changes what an invoice question looks like. When a logged-in customer asks 'where's the invoice for my last order' the bot reads the order postmeta, confirms the invoice number, and points at the My Account download link. When they ask 'why is there VAT on my Italian invoice but not the German one' the bot reads the per-order tax breakdown and explains the difference using the actual rates applied. When they ask for a re-issue with a corrected business name, the bot describes how the merchant handles credit notes rather than promising a regeneration the LLM cannot perform.

Display conditions scope the bot to logged-in customers on My Account and order pages, multibot lets a public sales bot run on the same site without any invoice context, and conversation logs capture every invoice question so support can tighten the prompt or fix a confusing field on the PDF template.

Invoice questions are unglamorous but high-volume, especially for B2B stores and any merchant trading across EU borders. The questions are narrow: where is the PDF for order 11892, why does my Italian invoice show reverse charge while my German one does not, can I get an amended copy with our new VAT ID. A generic chatbot bolted onto a WooCommerce store cannot answer any of those.

It does not know the invoice number, has no view of the tax breakdown, and will cheerfully invent a reverse-charge rule that contradicts what the plugin actually applied. Each wrong answer wastes finance team time and erodes trust with the kind of customer who reads invoices closely. Invoice-aware AI flips the workflow.

SleekAI reads the same order postmeta the PDF invoice plugin reads, so the bot's references match the document the customer is holding. Most invoice questions finish without a ticket: download a copy, explain the VAT treatment, walk through the credit-note workflow for amendments. Combined with multibot, a store can run a dedicated finance-aware bot scoped to logged-in customers on the account and order pages while a separate public bot handles pre-sale questions.

The bot never generates or emails invoices itself, which keeps the plugin's sequential numbering, retention, and audit log intact (a non-negotiable in many jurisdictions). Conversation logs surface the labels and translations that confuse customers most often, which usually points at small admin fixes rather than prompt edits. The result is a chatbot that takes a measurable share of finance email off the inbox without ever putting the merchant's invoicing compliance at risk.