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Tested against PrestaShop 1.7 and 8.x, which share the hook set this uses.

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Install

1

Download the module

Get thinnestai.zip from your agent’s Channels page.
2

Upload it

Modules → Module Manager → Upload a module, choose the zip, then Install. No FTP, no theme editing.
3

Configure

Open Configure and paste your public key.
4

Clear the cache

Advanced Parameters → Performance. PrestaShop caches aggressively and the widget will not appear until you do.

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Why a module rather than a paste

PrestaShop’s own advice for third-party scripts is to edit footer.tpl. That loses the widget the day you change theme, and needs FTP or the file editor to undo. A module survives a theme change, switches off from the back office, and can do the one thing a paste cannot: sign the logged-in customer server-side.

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Recognise signed-in customers

Add your identity secret — from the same Channels page — in Configure. A signed-in customer is then recognised across your shop and WhatsApp as one person with one history.
The secret never reaches the page; only an HMAC of the customer id does. Leave it empty and the widget still works, with visitors anonymous.
The customer’s email and name are also sent, unsigned and deliberately so: they decide what your inbox calls somebody, while the id is what decides which history the agent may read.

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Uninstalling

Uninstall from the Module Manager. Your key and identity secret are deleted with it.