Meta WhatsApp Cloud API Integration Specialist

a multi-tenant SaaS POS & business-automation platform (.NET 8 / ASP.NET Core backend, React frontend, MySQL). We have built a WhatsApp Business Platform integration using Meta Embedded Signup ("Continue with Meta" Facebook login flow), modeled on the Tech Provider / ISV pattern — our merchants connect their own WhatsApp Business numbers to our platform in one click. The code is complete and tested. We need a specialist to take the integration from "code-complete" to "live and approved by Meta." What's Already Done (you don't build this) Backend service: OAuth code exchange, WABA subscribe/unsubscribe, phone-number info, 4-checkpoint connection health check (OAuth / Subscribe / Payment / Template) — with full xUnit test coverage API endpoints for embedded-signup config, token exchange, subscription management React UI: "Continue with Meta" button (FB JS SDK popup + postMessage handling), WhatsApp workspace dialog with connection management, reconnect flow Meta App created with WhatsApp use case, Business verification done, App Review submission drafted (all 4 permission descriptions + agreements completed; API test calls completed for business_management and whatsapp_business_management; messaging test call pending processing) What You Will Do Complete Meta App Review for whatsapp_business_messaging, whatsapp_business_management, business_management: Produce the 3 required screencast recordings demonstrating the end-to-end permission usage in our product Verify all API test calls show "Completed" on the Testing page Submit for review and handle any reviewer feedback/rejections until approved Production go-live: Rotate and securely store the Meta App Secret (move out of appsettings into secret management) Run our WhatsApp table migrations against per-tenant store databases Register and verify the webhook endpoint (message status, inbound messages) in the Meta dashboard Complete one real supervised Embedded Signup connection and validate the 4 health checkpoints pass Meta business-side configuration: WhatsApp Manager setup: payment method linking, template creation & approval Tech Provider onboarding registration for our business Advise on WABA asset assignments in Meta Business Settings (we had a prior WABA bound to another provider's app) Handover: document the runbook — token lifecycle, webhook re-verification, adding new tenants, common Meta error codes (#200, subcode 33, etc.)