checkout page is not working

Hello Team, We are encountering an issue with the WordPress–BigCommerce integration related to cart synchronization during checkout and would appreciate your assistance. Current Setup Frontend / UI : WordPress Products, Cart & Checkout : BigCommerce Website (WordPress): https://www.afittingexperience.com/ BigCommerce Store: https://a-fitting-experience-mastectomy-shoppe.mybigcommerce.com/ Issue Description Previously, cart items were correctly carried over to the BigCommerce checkout page. Currently: Users are redirected to the BigCommerce checkout page successfully. The checkout page loads with 0 cart items , even though the cart exists in BigCommerce (verified via API). Proceed to Checkout Implementation <form action=” https://www.afittingexperience.com/bigcommerce/checkout/5794f692-779c-466a-945e-9ec77a4f9b9f” ; method=”post”> <button type=”submit”>Proceed to Checkout</button> </form> BigCommerce API Verification We have verified the checkout/cart using BigCommerce APIs and confirmed that: A checkout/cart ID is generated successfully. The cart contains products with correct pricing. The checkout is associated with the correct channel. This confirms that cart creation is working as expected on the BigCommerce side. Verification Request (Important) To help isolate the issue, could you please verify the checkout behavior for both scenarios below: Guest Customer Add products to cart from the WordPress site Click Proceed to Checkout Verify whether cart items appear on the BigCommerce checkout page Existing Customer Login using the following test credentials: Email: design@marketingsuccess-x1.com Password: Deep@123 Add products to cart from the WordPress site Click Proceed to Checkout Verify whether cart items appear on the BigCommerce checkout page Suspected Area The issue appears to be related to how the checkout session or context is handled during the redirect from WordPress to BigCommerce, as the cart exists but is not reflected on the checkout page after redirection. Assistance Required Kindly help us review: The checkout redirect flow implemented by the WordPress plugin. Whether the current approach aligns with the recommended method for preserving cart context. Any differences in behavior between guest and logged-in customers. Any recent plugin updates that could affect checkout synchronization. We believe verifying both guest and existing customer flows will help pinpoint the root cause. Looking forward to your guidance. Best regards, Dhruvik The page I need help with: [ log in to see the link]