Dear @SanfordWhiteman,  I have spent many hours sifting through general guidance, hints, and scattered implementation details that you have kindly offered in posts over the past 5 or more years regarding regarding associating imported SFDC leads with existing anonymous leads.  I've now spent many more hours trying to understand and implement the solution for my client.  It's all been slow going since although I have a technical background, Marketo is new territory.  I've tried very hard to figure this out myself, but I'm not quite there, and hoping you would be willing to help me out. I have created a loopback webhook with the following values: URL: http://localhost/index.php/leadCapture/save Payload Template: munchkinId={{lead.Marketo Munchkin}}&FormId=1024&Email={{lead.Email Address}}&returnLPId=-1 Request Token Encoding: Form/Url Request Type: POST Response Format: None {{lead.Marketo Munchkin}} is an imported SFDC field containing the munchkin value from a (non-Marketo) form generated lead. I've created a webhook monitoring operational campaign that is checking for something other than a 302 response.  I call the webhook from another campaign where I've been testing on individual leads that have a munchkin value in the  {{lead.Marketo Munchkin}} field.   My main difficulty at the moment, is that I don't know how to check or debug the result of the webhook call.  I'm not seeing associated website activity for the individual record I've tested.  It seems that the webhook call is returning a 302, but beyond that I can't figure out how to determine if the parameters and values I've chosen in the webhook payload are correct.  Is there any way to get more results from the loopback call then whether the response code was 302? One thing I'm not seeing in any activity log is the name of the form I created, #1024 referenced above.  While I do see activity indicating the webhook is getting called, and the monitoring is getting called.  This is the kind of question a little more system feedback would be helpful with.  I tried enabling a JSON response instead of none, and returning the "success" parameter in the webhook response mapping, but this didn't seem to work.  And I'm afraid this demonstrates where my experience is limited and my understanding is incomplete.  Any help would be appreciated.  Update: now it seems the webhook is not returning "HTTP Error 302: URL moved temporarily."  I'm quite sure it was returning that earlier in my testing, but won't swear to anything.  In any case, I'm faced with a similar dilemma, how do I determine what code is being returned if it's not 302? Thank you, David L Kaplan ... View more