Urgent WordPress Custom Theme Fixes Required, Expert developer

Hello,
(Only reply if you are sure you can fix it, and how long it will take you to finish all tasks)
We need an expert WordPress/WooCommerce developer to urgently fix issues on our custom theme website. All problems are new and appeared within the last 2 months. We need clear timelines for each task before starting.

Tasks to Fix:

1) Revolut Payment Gateway Issues (recently activated instead of Stripe)

Checkout freezes after clicking Place Order or takes 10–15 seconds to confirm. The new order email is received before page updates.

Apple Pay not working.

Invoice Pay link: Customers cannot input card details when using invoice link. Google Pay works, but card input fails.

Action: Debug Revolut plugin integration, ensure payment confirmation works correctly, Apple Pay functional, invoice links accept card payments.

Expected: Checkout fully functional, all payment methods working reliably.

2) Infinite Scroll on Category Pages

Currently inactive; only 10 products displayed.

Action: Enable infinite scroll, ensure smooth loading, maintain performance.

Expected: Category pages load more products automatically as user scrolls.

3) Contact Form Email Issue

Emails not reaching Gmail.

Likely related to Cloudflare DNS settings.

Action: Check and configure SPF, DKIM, DMARC; configure WP Mail SMTP for Gmail; ensure reliable delivery.

Expected: All contact form emails reliably received in Gmail inbox.

4) Subscription Form Redirect Issue

Form at bottom of homepage redirects to a blank page.

Action: Debug subscription form, ensure it works with actual entries, confirm correct redirection or confirmation message.

Expected: Subscription form works correctly; submissions recorded.

5) Footer Options Not Responsive on Mobile

Footer links are unclickable on mobile.

Action: Debug CSS/JS to ensure mobile touch events and responsiveness are fixed.

Expected: Footer fully functional on mobile devices.

Requirements:

Experienced in WordPress custom themes + WooCommerce.

Must provide estimated completion time per task before starting.

Must test on both desktop and mobile.

Code edits must not break existing functionality.

Must communicate clearly if additional steps are needed.

Urgency: All issues are urgent; need immediate availability.