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Custom Fields Fieldtype
The Reinos Store - Custom Fields fieldtype holds the custom fields of an order or an order item that is synced to an entry (see Sync to Entries). In the entry form it shows the fields in a table, in your templates you show them with a tag pair named after the field.

Tag pair
{your_field_name}
{custom_fields:label}
{custom_fields:value}
{/your_field_name}{custom_fields:label}: the label of the custom field, or its name when it has no label{custom_fields:value}: the value the customer entered
Example
{exp:channel:entries dynamic="no" entry_id="100" status="Order Open"}
<ul>
{o_custom_fields}
<li><strong>{custom_fields:label}:</strong> {custom_fields:value}</li>
{/o_custom_fields}
</ul>
{/exp:channel:entries}