Help please - integration of Natwest Tyl (Shopping Cart)

Hi - sorry all I am very not techy but want to add a payment function to my website. Square space has limited options (PayPal, Stripe etc), but I want to ideally use the one from my own card provider - we are a physical store. The supplier is Natwest Tyl. They have said that it is compatible with:

Supported Shop Systems

• AceShop
• CCV Shop
• commerce:SEO
• CRE loaded
• CS-Cart
• Drupal Commerce
• Ecwid
• Gambio
• JTL
• LemonStand
• Magento
• Magento 2
• Mijoshop
• modified-shop
• Odoo
• OpenCart
• osCommerce 2.x
• OXID eSales
• Plentymarkets
• PrestaShop
• SEO:Mercari
• Shopify
• Shopware 5
• Shopware 6
• ShopPro
• Ubercart 2.x
• Ubercart 3.x
• WordPress E-Commerce
• WordPress Event Espresso
• WordPress JigoShop
• WordPress WooCommerce
• X-Cart
• XoniC
• xt:Commerce v 3.x
• xt:Commerce 4, 5 und 6
• Zen Cart

I contacted Squarespace and they said I would need to code the website myself for this. But that sounds scary and I don't know how to do it. Can anyone help. It is just for deposits anyway, so would be a hidden page with just the cart on that we would send the link to. 

Thanks in advance 🙂

Hi DentalPhil - did you ever solve this? I have exactly the same requirement and would be interested to know how you have resolved this. Thanks!