> For the complete documentation index, see [llms.txt](https://firstoken.gitbook.io/api-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://firstoken.gitbook.io/api-docs/api-reference/risk/payer-authentication-3d-secure/detailed-flow-scenarios.md).

# Detailed Flow Scenarios

<img src="/files/UK9VnUPa6AXN1rprulvB" alt="All 3-D Secure flows has the following steps, some of them don’t need validation, some of them need it." class="gitbook-drawing">

#### Integration Workflow

1. Call our **Setup** endpoint to initialize the process
2. Implement **Cardinal Songbird SDK** for device data capture
3. Call our **Check Enroll** endpoint with collected device data
4. Handle the three possible outcomes:
   * **Success**: Proceed directly to authorization
   * **Pending**: Show challenge modal, then call **Validate** endpoint
   * **Failed**: Handle declined transaction
5. Use authentication results for **Authorization** with your chosen payment method