WordPress Digital Product Selling Website + Existing Website Error Fix

I am looking for an experienced WordPress developer to complete two related tasks for my websites.

Task 1: Build a Digital Product Selling Website:

I want to create a professional and modern WordPress website for selling digital products.
The website should be:
- Fully responsive on mobile, tablet and desktop
- Modern, clean and user-friendly
- Easy to manage from the WordPress admin panel
- Optimized for good loading speed
- SEO-friendly
- Secure and reliable

Digital Product Website Requirements:

The website should include:
- Home page
- Digital product/shop page
- Product details page
- Product categories
- Shopping cart
- Checkout page
- Customer account/login system
- Order history
- Secure digital product download/access
- Automatic order confirmation email
- Automatic download/access email after successful payment
- Payment gateway integration
- Contact page
- About Us page
- Privacy Policy, Terms & Conditions and Refund Policy pages
- WhatsApp/social media integration if required

I want customers to have a simple and smooth experience from product selection → payment → order confirmation → digital product download/access.

Task 2: Fix an Error on My Existing WordPress Website

I also have an existing WordPress website where an error is currently showing.

I need the developer to:

- Identify the exact cause of the error
- Fix the error properly
- Make sure the existing website functionality is not affected
- Check for any related plugin/theme compatibility issues
- Test the website after fixing the problem

I can provide access to the existing website and show the developer the error after the project starts.

Important:

I am looking for someone who has good experience with:
- WordPress
- WooCommerce
- Digital product websites
- Payment gateway integration
- Secure digital downloads
- WordPress troubleshooting
- PHP
- HTML/CSS
- JavaScript
- WordPress plugins and themes
Please inspect my requirements and existing website carefully before making major changes.

Do not install unnecessary plugins or make major changes without discussing them with me first.

When Applying, Please Provide:

1. Examples of digital product/e-commerce WordPress websites you have built.
2. Examples of WordPress errors you have fixed.
3. Your recommended approach for this project.
4. Estimated delivery time.
5. Your total project cost.
6. Please confirm whether you can complete both tasks.
I prefer a developer who can build the new website professionally and also troubleshoot the existing WordPress website.