List custom fields

This endpoint returns all custom fields at once. No pagination is supported.

Custom Field Object

Each custom field includes:

• id - Unique field identifier
• label - Field label displayed to users
• type - Field type (text, number, select, multi-select, checkbox, date, file)
• required - Whether the field is required
• placeholder - Placeholder text (for text/number fields)
• public - Whether the field value is publicly visible
• internal - Whether the field is for internal use only
• options - Array of options (for select/multi-select fields)
• allowMultiple - Whether multiple files can be uploaded (file fields only)