WhatsApp API Developer Account Setup

I need a specialist to walk me through the complete setup of a Meta developer environment focused on the WhatsApp Business API. The goal is to finish with a live, fully verified developer account and an app that I can immediately plug into other services for automated messaging, web-hooks, and data exchange.

Here is what I expect by the end of the engagement:
• A Meta Business account and corresponding WhatsApp Business API Developer account created, verified, and linked to my business phone number.
• A Facebook Developer app properly configured, because I will be using it for Integration with other services rather than for marketing or analytics.
• Access tokens, webhook URLs, and any required permissions generated and demonstrated in a quick test so I can confirm messages flow end-to-end.
• Clear, step-by-step documentation (screenshots or short screencast) showing how everything was configured, so I can maintain the setup myself later.

If you have already handled WhatsApp Business API onboarding and Facebook App review before, your guidance will save me time and mistakes. Let me know your estimated timeline and any information you need from my side to get started.