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

# Overview

> Extend Commerce V1 to control shopper interactions and compliance flows.

Extension Services let you plug your own services into Commerce V1 to handle shopper-facing interactions and compliance requirements that vary by business.

<CardGroup cols={2}>
  <Card title="Checkout Experience" icon="browser" href="/products/commerce/v1/integration/extensions/checkout-experience">
    Control how shoppers interact during payment — from collecting card credentials to completing 3-D Secure challenges.
  </Card>

  <Card title="SEPA Mandate Signing" icon="file-signature" href="/products/commerce/v1/integration/extensions/sepa-mandate-service">
    Provide your own mandate signing service to handle SEPA Direct Debit mandate collection and lifecycle.
  </Card>
</CardGroup>