Drupal Commerce Developer Needed, Authorize.Net Shopping Cart Integration

We are looking for an experienced Drupal developer with hands-on experience in Drupal Commerce and Authorize.Net to upgrade an existing Drupal website and implement a secure shopping cart/payment system. 1. Install and configure Drupal Commerce. 2. Implement shopping cart and checkout functionality. 3. Integrate the site's existing Authorize.Net merchant account with Drupal Commerce. 4. Preferably implement Authorize.Net Accept Hosted or another recommended PCI-conscious integration where card information is not stored on the Drupal server. 5. Configure order confirmations, transaction records, customer emails, and administrative order management. 6. Test the complete system on staging before deploying to production The Commerce system will primarily be used for non-physical purchases such as: • Event registrations • Meeting registrations • Sponsorships • Membership-related payments • Other fees and services Shipping functionality is not currently required. The system should be designed so administrators can easily add additional events, registrations, sponsorships, and other products in the future. Please Answer These Questions With Your Proposal 1. How many Drupal Commerce sites have you personally developed? 2. Have you integrated Authorize.Net with Drupal Commerce? Please describe the implementation. 3. Have you worked specifically with Authorize.Net Accept Hosted? 4. Have you completed Drupal 10 → Drupal 11 upgrades? 5. How would you approach upgrading our current Drupal 10.6.15 / PHP 8.1.34 installation? 6. How would you prevent credit-card information from touching or being stored on our Drupal server? 7. How would you handle declined payments, refunds, voids, and payment/order synchronization? 8. Please provide 2–3 examples of Drupal Commerce projects you have personally developed. 9. What potential risks or issues would you investigate before beginning this project? 10. Please provide your estimated hours and/or fixed-price estimate.