Digital Store Development

I'm looking for a skilled developer to create a digital store for selling online information as one-time purchase products.

Key Requirements:
- User-friendly interface
- Secure payment gateway integration
- Product categorization and search functionality
- Mobile responsiveness

Ideal Skills and Experience:
- Experience in e-commerce development
- Proficiency in payment gateway integration
- Strong UI/UX design skills
- Knowledge of SEO best practices

Please provide samples of previous work.