WhatsApp multi number shared inbox developer

We need a developer to build a simple unified WhatsApp inbox for our business. We currently have multiple WhatsApp Business phone numbers and want to manage all incoming and outgoing conversations from one interface. Main requirements: * Connect multiple existing WhatsApp numbers/accounts. * Display conversations from all numbers in one dashboard. * Clearly show which WhatsApp number received each message. * Send and reply to messages from the correct WhatsApp account. * Support text, images, documents, voice notes, and other common WhatsApp messages. * Search conversations and contacts. * Keep WhatsApp sessions connected without requiring QR scanning every time. * Run locally on a Windows computer that stays online 24/7. * Prefer a simple web-based or desktop interface accessible from computers on our network. * Ability to add or remove WhatsApp numbers later. We prefer a lightweight solution and do not need a complicated CRM. Please mention in your proposal: * Whether you will use the official WhatsApp Business API or WhatsApp Web sessions. * Any recurring costs required after development. * Maximum/recommended number of WhatsApp accounts. * What happens if WhatsApp changes its Web/API system. * Examples of similar projects you have built.