My sweet shop already runs on the RanceLab billing system, and I want an active Interakt WhatsApp Business API account. The next step is to connect the two so every customer interaction—from billing to marketing—is handled automatically through WhatsApp. Core workflow • When a bill is saved in RanceLab, the customer’s WhatsApp number must instantly receive: – an order confirmation, – a PDF or image copy of the invoice, – a live order-status update link. • Promotional campaigns should be schedulable from within Interakt (or via a small companion dashboard) so I can push targeted festival offers without manual exports. • For customer support, staff need a single chat thread where they can pull up the last invoice and resend it on request. No separate ticketing portal—everything stays inside WhatsApp. Technical expectations – Use Interakt’s official REST webhooks and template system; no unofficial work-arounds. – The solution must pick data straight from RanceLab’s database or its available export/API, keeping customer name, mobile, items and total intact. – Logging of every outgoing message is required for compliance. – Final hand-over includes well-commented source, setup guide and a quick video walkthrough so my in-house team can maintain it. I’m open on language and framework as long as it is stable on Windows Server and can run unattended. Let me know your proposed approach, timeline and any clarifying questions so we can get this flowing smoothly.