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

# Checkout Custom Fields

> Enable custom fields on product checkout sessions.

This feature allows you to collect additional information from customers during checkout by adding customizable fields to your product purchase flow.

## Getting Started

Setting up custom fields for your product is straightforward and requires minimal configuration:

1. Navigate to Your Product Settings
   * Log into your Creem Dashboard
   * Go to "Products" section
   * Create a new product
   * Enable "Custom Fields" feature
2. Configure Your Custom Fields
   * Choose the field type (text, number, email, etc.)
   * Set the field name and label
   * Configure input validation rules
   * Save your configuration

## How It Works

When custom fields are configured, they automatically appear during the checkout process. The collected information is then:

* **Stored securely:** All custom field data is encrypted and stored securely
* **Accessible via Webhook:** Data is included in the `checkout.completed` webhook event
* **Available in Dashboard:** View responses in your merchant dashboard

## Common Use Cases

* **Integration IDs:** Collect user IDs from other platforms or systems
* **Contact Information:** Gather phone numbers, alternative email addresses, or social media handles
* **Customization Details:** Collect preferences, sizes, or specifications
* **Business Information:** Company names, tax IDs, or registration numbers
* **Event Details:** Dates, attendance information, or dietary preferences

## Best Practices

* Keep required fields to a minimum
* Use clear, descriptive field labels
* Select appropriate validation rules
* Consider mobile user experience

**Pro Tips**

* Use conditional fields when appropriate
* Group related fields together
* Test the checkout flow thoroughly

## Webhook Integration

Custom field data is automatically included in the `checkout.completed` webhook payload, making it easy to integrate with your systems.
[Learn more about the checkout.completed webhook](https://docs.creem.io/code/webhooks).