How to verify the ID token on the back end and the well-know config endpoint is not found

[steel1041]

Hi snapchat team,
we integrate the login kit on the App side. After the App client gets the id token, we plan to send it to the back-end for verification, but we haven't found any detailed instructions in the document.
we only found these comments.
// optional: for Snap OIDC (OpenID Connect) token // Snap OIDC (OpenID Connect) provides a generic authentication and identity solution // that allows otherwise different systems to interoperate and share authentication state // and user profile information. // Typically, this allows 3rd party backend services to accept and authenticate requests // from Snap clients. .withIdToken()

  And also we can't find **well-known/openid-configuration** service. Could you help?