I need a PHP developer to wire up social sign-in on my landing page. The essentials are: • Facebook Login, Google Sign-In, and Sign in with Apple, each integrated with their official PHP/JavaScript SDKs and displaying the standard button styles. • A WhatsApp “Share” button that opens the native share intent with a preset message and the page URL. I don’t have any developer apps configured yet, so I’ll rely on you to either guide me through creating the required keys and secrets or provide a concise setup guide I can follow. Deliverables 1. Working code dropped into my existing plain-PHP landing page. 2. User data (name and email) stored in a PHP session upon successful authentication. 3. Clear installation and testing instructions so I can move everything to production. Acceptance criteria: the page must load without console errors, each social login must complete end-to-end in test mode, and the WhatsApp share should function on mobile devices and WhatsApp Web. If you’ve done this before and can turn it around quickly, let’s get started.