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  • 1.  loginPKCEGrant() works with existing Implicit Grant OAuth client. Expected migration behavior?

    Posted 05-07-2026 05:46

    Hi,

    We are currently migrating our browser application from loginImplicitGrant() to loginPKCEGrant() because of the announced deprecation of the Implicit Grant flow.

    What surprised us is that loginPKCEGrant() appears to work successfully against an existing OAuth client that is still configured as an Implicit Grant client in Genesys Cloud.

    Scenario:

    • Existing OAuth client created years ago

    • OAuth client still configured with Token Implicit Grant

    • Frontend code updated to use:

    client.loginPKCEGrant(clientId, redirectUri)

    • Authentication succeeds

    • Access token is returned successfully

    This actually creates a very useful migration path for us:

    1. Upgrade customer environments to PKCE-compatible application code first

    2. Leave existing OAuth clients untouched temporarily

    3. Ask customers to update the OAuth client configuration later

    4. Avoid downtime or coordinated releases

    Question:

    Is this officially supported/expected behavior during the migration period, or are we relying on permissive legacy behavior that could stop working unexpectedly before the final Implicit Grant removal date?

    In other words:
    Can existing Implicit Grant OAuth clients safely continue to authenticate through PKCE during the transition period?

    Thanks.


    #PlatformSDK

    ------------------------------
    Peter Vledder
    Solution Consultant
    ------------------------------


  • 2.  RE: loginPKCEGrant() works with existing Implicit Grant OAuth client. Expected migration behavior?

    Posted 05-07-2026 10:31

    Hello,

    I just checked internally (with Auth engineering) and they confirmed it is the intended behavior - for the exact same reason you described - to ease/facilitate the migration of existing OAuth clients.

    Regards,



    ------------------------------
    Jerome Saint-Marc
    Senior Development Support Engineer
    ------------------------------



  • 3.  RE: loginPKCEGrant() works with existing Implicit Grant OAuth client. Expected migration behavior?

    Posted 05-11-2026 10:31

    Thanks for your anwser! Really happy that this is intended!



    ------------------------------
    Peter Vledder
    Solution Consultant
    ------------------------------

    Original Message


  • 4.  RE: loginPKCEGrant() works with existing Implicit Grant OAuth client. Expected migration behavior?

    Posted 13 days ago

    Hi Peter, Hope you are doing well. Are you able to migrate your Interaction Widget from Token Implicit Grant to PKCE.  Your inputs would be really helpful. Im trying to migrate the same but encountering an issues in authentication, whether the interaction widgets be supported ?



    ------------------------------
    Gopalakrishnan M
    Manager
    ------------------------------

    Original Message


  • 5.  RE: loginPKCEGrant() works with existing Implicit Grant OAuth client. Expected migration behavior?

    Posted 13 days ago

    Hi Gopalakrishnan,

    Make sure you are on the latest SDK version, otherwise you get funny results :-(

    Best Regards,

    Peter



    ------------------------------
    Peter Vledder
    Solution Consultant
    ------------------------------

    Original Message


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