Seamless Embedded WhatsApp Signup

My custom-built web app (NestJS + Prisma stack) already holds both WhatsApp Business verification and Meta Tech Partner status, yet the embedded sign-up flow still stalls during the verification stage. I’m looking for someone who has personally completed this exact integration before—no first-timers, please.

Your task is to rebuild or refine the embedded onboarding so a business owner can connect their WhatsApp Business account straight from my site without ever being bounced to Facebook Business Manager. All API permissions are active; what’s missing is the straightforward, one-screen experience that Meta showcases in its docs.

Key expectations
• End-to-end embedded sign-up working in production, with verified phone numbers automatically appearing in my Meta Business account.
• Clean NestJS service/controller code plus the Prisma model updates (if any) so you and my team can connect and fix it
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I’ll give you access to our Meta App, system env variables, and a staging branch the moment we agree on milestones. Let’s get users onboarding in minutes, not hours.