Squarespace
Squarespace sites
The catalog stays on the store. Card checkout opens on UGOpayme, then the order comes back paid.
Integrations/Squarespace/Setup
Keep the Squarespace store, theme, and catalog.
Squarespace Commerce does not take a custom card gateway. Add a checkout button that opens UGOpayme, then mark the order paid from the signed webhook.
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.