Peptide E-commerce Site With Payments

I am launching a small, research-only peptide store and need a complete web presence that lets visitors browse products and check out smoothly. The primary focus is selling peptides, so the storefront, product pages, cart, and secure checkout flow all need to feel fast and trustworthy.

Payments must accept both credit/debit cards and PayPal from day one; please recommend and implement the best gateway or plugin combination for those options. I am open to WordPress + WooCommerce, Shopify, or a lightweight custom build—whichever you can stand behind for security, PCI compliance, and straightforward maintenance.

User accounts are not a hard requirement yet. Build the site in a way that allows guest checkout but can easily add account creation later if conversion data shows it would help.

Core needs
• Modern, mobile-responsive design branded for a professional laboratory audience
• Product catalogue with SKU management, stock status, and mandatory “for research use only” disclaimer on each item and during checkout
• SSL and secure payment flow fully tested in sandbox and live modes
• Simple admin dashboard where I can add or edit products, coupons, and content without touching code
• Basic SEO setup (clean URLs, meta tags, sitemap) so we rank for peptide keywords from the start

Once finished, hand over all credentials, theme or source files, and a brief video or call that walks me through routine tasks like updating products and processing orders.

In your proposal, show examples of e-commerce projects you have delivered with card and PayPal integration, note which tech stack you prefer for this job, and include an estimated timeline to first test transaction.