WhatsApp and Google API Integration on Panels

WhatsApp Business API (Embedded Signup) + Google API Setup on 2 Panels
Project Description:
We run two WhatsApp automation panels (Waziper/Wachap-style PHP) and need an experienced developer to complete the official WhatsApp Cloud API and Google API setup on both.
What you'll do:

Configure WhatsApp Embedded Signup (Tech/Solution Provider) so clients can connect their own WhatsApp number via an in-panel "Connect WhatsApp" button — on both panels.
Set up Meta App, Facebook Login for Business, Configuration ID, permissions (whatsapp_business_management, messaging, business_management), webhooks, and a permanent system-user token.
Handle the "number already registered" / coexistence + display-name + number verification.
Submit and get one message template approved per panel.
Set up Google API (Sheets mandatory, Calendar optional) — Service Account or OAuth — so booking data writes into a Google Sheet from each panel.

Deliverables: both panels production-ready, webhooks verified, tested end-to-end, plus a short handover doc + screen recording.
Note: This is technical API setup only — no chatbot/content building. We will provide a detailed scope document and limited, temporary access. You will NOT need our payment, AI, or SMTP keys.
To apply: confirm you've set up Embedded Signup as a Tech/Solution Provider before (1 line on a past example), and give a fixed price + delivery days.

Skills / Tags:
WhatsApp API · Meta Cloud API · Facebook Graph API · OAuth · Google Sheets API · Google Cloud · Webhooks · PHP · API Integration