> ## Documentation Index
> Fetch the complete documentation index at: https://docs.joinmarkt.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Checkout Field Context

> Custom field groups for checkout cart lines.

# Checkout Field Context

```bash theme={null}
POST /api/checkout/field-context
```

Returns custom field groups for products/variants in the cart so checkout can render delivery custom\_fields inputs.

Used by the checkout UI — not typically called from merchant embed snippets.

Related delivery type: custom\_fields (see Enums and How Delivery Works).