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

# Callback to complete authentication flow

## Endpoints

<Card title="Callback endpoint to be used by 3rd party authentication system to report about authentication validation" icon="arrow-right" href="/payment/api/callback-to-complete-authentication-flow/callback-endpoint-to-be-used-by-3rd-party-authentication-system-to-report-about-authentication-validation" horizontal>
  **POST** /v1/callback/\{institutionCode}/\{customerNumber}/\{sessionId}
</Card>