video1.0<iframe src="https://www.loom.com/embed/7aabdd5d68a7461598a27ac04e90abea" frameborder="0" width="1920" height="1440" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>14401920Loomhttps://www.loom.com14401920https://cdn.loom.com/sessions/thumbnails/7aabdd5d68a7461598a27ac04e90abea-a54f8b5cf3a718a7.gif105.515This Loom shows how Switchboard cart validation can block customers from adding more than one item to their cart. Justin explains using a validation rule with custom conditions set to greater than or equal to two, so the cart is blocked when the quantity reaches that threshold. He notes the validation takes about five seconds to mount, then demonstrates the first product being rejected when added. He also shows that adding a different product triggers the same rejection until the existing item is removed.