The GET /{{envID}}/rp/authenticate?providerId={{idpID}}&flowId={{flowID}} endpoint creates a new external authentication with an identity provider. It redirects users to the authentication initialization endpoint at the external authentication service.

This endpoint supports the following query parameters:

A string that specifies the ID of the identity provider.

A string that specifies the ID of the flow resource.

The authentication context references values that will be sent to the IDPs that support this. This has the same semantics as the acr_values parameter from OpenID Connect.