WhatsApp AI agent UK: setup, costs and rules

In the UK, WhatsApp is where customers expect fast, practical answers — whether they are checking a parcel delivery window, confirming a clinic appointment or sending a photo of a faulty item. Running support on a single WhatsApp Business phone in the office quickly breaks down once more than one person needs to reply.

Connecting an AI support agent to the official WhatsApp Business Platform (Meta Cloud API) lets you answer routine questions 24/7 with interactive buttons and status cards, while routing exceptions into a shared team inbox. Here is how setup, Meta's rules and pricing work for UK businesses.

Cloud API vs the WhatsApp Business mobile app

Meta offers two products. The free WhatsApp Business mobile app is tied to a phone and cannot be connected to an API agent or multi-team helpdesk. The WhatsApp Business Platform (Cloud API) is Meta's official API for businesses: it supports automated agents, interactive buttons and lists, webhook events and unlimited team members replying from a help desk like Threads.

Step-by-step setup in the UK

1. Verify your business in Meta Business Suite: Submit your UK company details (matching Companies House) in Meta Business Settings.
2. Register a phone number: You can use a new UK mobile or landline number (verified via SMS or voice call) or migrate an existing number after removing it from the mobile app.
3. Connect to Threadbox: In Threadbox Channels → WhatsApp, paste your Meta Phone Number ID, WhatsApp Business Account ID and permanent system user access token, then register the signed webhook URL.
4. Configure your agent and escalation rules: Select which knowledge sources, API actions and regex webhooks run on WhatsApp, and set the rules that hand conversations to your team.

Meta's 24-hour customer service window explained

WhatsApp enforces strict anti-spam rules:

• When a customer messages you first, a 24-hour customer service window opens. Within those 24 hours, your AI agent and your human team can send free-form replies, interactive buttons, lists and status cards.
• Once 24 hours have passed since the customer's last message, you can only message them using a pre-approved Meta template message (for example a shipping update or appointment reminder).

What a WhatsApp AI agent costs in GBP

There are two cost layers to understand:

• Meta messaging fees: Meta bills directly on your Meta Business Account per template category (marketing, utility, authentication) while service conversations initiated by customers within the 24-hour window follow Meta's current rate card. Threadbox passes through zero markup on Meta's fees.
• Threadbox plan: The WhatsApp channel is included from the Threadbox Growth plan (£99/month ex VAT, which includes 2,000 AI conversations, 5 seats, email, web widget and custom API actions).

UK GDPR considerations on WhatsApp

WhatsApp chats contain phone numbers and personal data. Threadbox stores transcripts and attachments in the UK/EU, signs an Article 28 DPA on request, and lets you export or erase customer records in one click. Read our UK GDPR AI chatbot guide and the WhatsApp integration page to get started.