Skip to main content
A JSON-encoded object used by Supercycle’s cart validation to enforce rules at checkout. Multiple validations are merged into a single object — only the relevant keys will be present for a given line item.
Example
{
  "membership": { "credits": 5 },
  "required_variant": { "id": 987654, "per_line": 1 },
  "quantity": { "max": 3 },
  "uniformity": { "key": "rental_start", "value": "2025-01-01" }
}

​
Validations

​
membership
object
Validates that the customer has enough membership credits to complete the rental.
​
required_variant
object
Validates that a specific variant (e.g. a deposit) is present in the cart alongside this line item.
​
quantity
object
Validates that the quantity of this line item does not exceed available inventory.
​
uniformity
object
Validates that all rental line items in the cart share the same value for a given property. Used to prevent mixing incompatible options (e.g. different rental start dates).