BigCommerce
BigCommerce catalogs
The catalog stays on the store. Card checkout opens on UGOpayme, then the order comes back paid.
Integrations/BigCommerce/Setup
Keep the BigCommerce store, theme, and catalog.
In BigCommerce, add an offsite payment gateway that sends the shopper to UGOpayme and updates the order when the signed webhook arrives.
Checkout opens on UGOpayme. Sandbox stays sandbox until this store is marked live.
The shopper pays with Visa or Mastercard. A signed webhook marks the order paid, then they return to your store.