OpenCart AI Chatbot (self-hosted, no SaaS) — Free DonateWare

What it is: a lightweight, production-ready AI shopping assistant for OpenCart that you host yourself. It injects a floating chat button via the Google Analytics Code box (so no core changes), talks to your own PHP endpoints under /ai/, and uses your OpenAI (ChatGPT) API key.
Built and tested on OpenCart v3.0.3.9; should work on other versions that still expose the GA insert point.

Key features

Self-hosted: no third-party widget or external SaaS gating usage.
RAG search over your shop: recommends products, categories, manufacturers, info pages, and optional Journal 3 blog posts using MySQL FULLTEXT.
Respects catalogue rules: only returns items that are enabled, available, in stock (or not subtracting), in the current store, and (optionally) allowed for the visitor’s customer group.
Learning KB (no vectors needed): curate answers from real chats into a simple Knowledge Base (KB). Published KB entries become first-class grounding for future replies.
Clean overlay UI: Markdown links, bolded titles, safe link allow-list, phone/email hand-off, optional “Live chat” link, company logo footer.
Anti-abuse & hygiene: origin lock (CORS), token auth, per-IP rate limiting, URL blocking in user input, and light PII scrubbing in logs.
Health check: /ai/ai-health.php confirms config, DB connectivity, and indexes.
No theme lock-in: Journal 3 blog support is optional—if those tables aren’t present, it simply skips blog indexing.

If you change to code for the better please place it here for other users to benefit from. I make no apologies for the coding, I'm 70 years old and am not into people saying I should have done this or that. Change it if you wish, up to you - if you do send me a copy.

Obviously, make backups of all your site before using mods and scripts. You may have to change directory names.

Have fun
Regards
Adrian