Experienced and REAL MAGENTO DEVELOPERS ONLY!!

Environment:
- Magento 2.4.3-p3
- PHP 7.4
- Plesk 18 (NGINX + Apache) on Ubuntu 22.04
- Stripe Payments 4.5.1 (recently upgraded from 3.5.1)
- Webkul Marketplace (MUST remain active)

Current Critical Issues:
After upgrading Stripe to 4.5.1, checkout is failing on the REST API calls BEFORE Stripe’s payment_intent is triggered.

1. PUT /rest/V1/guest-carts/{{cartId}}/selected-payment-method
→ 400 Bad Request + full error dump
→ "The payment method you requested is not available"

2. POST /rest/V1/guest-carts/{{cartId}}/payment-information
→ "Cannot place order because a payment method was not provided"

Stripe endpoints are OK:
- /v1/payment_methods → 200 OK
- /v1/tokens → 200 OK
But Magento never triggers payment_intent.create or payment_intent.confirm.

This is a pure Magento checkout issue: quote, DI/plugins, payment method assignment, or Webkul integration.

Your Tasks:

PHASE 1 — Critical API Fix (Priority)
1. Analyse checkout failures
2. Identify exact root cause
3. Implement corrections (Stripe 4.5.1 + Webkul compatibility + quote/payment fix)

PHASE 2 — UI Fixes (Web)
1. Verify/repair landing page spacing issue
2. Restore card form display after Stripe 4.5.1 upgrade
3. Remove duplicated reviews (appear 2–3× on mobile + desktop)

Estimated: under 2 hours

PHASE 3 — Upgrade Path (If you deliver good work)
- Upgrade Magento to 2.4.7
- Upgrade PHP to 8.1 or 8.3
- Full Stripe + Webkul migration with zero downtime

Requirements:
- Only REAL Magento developers (no agencies, no juniors)
- Deep experience with:
✔ Magento 2 checkout internals
✔ Stripe Payment Intents + Apple Pay
✔ Webkul Marketplace checkout flows
✔ Quote/payment assignment errors
✔ Plesk routing (NGINX + Apache)
✔ Magento 2.4 upgrades
- No meetings. No calls. Written-only debugging.
- Must produce a log of changes and root-cause summary.