>Will there be any time before the switch-over that the API returns both the new “marketoGUID” string field and the existing ActivityId?We may be adding this in our Minor release n...
There's not really a readily available way to perform this association right now. I've opened up an improvement ticket to see when we can get these returned in the Get Campaigns re...
In cases where there's a lot of resource competition and you're trying to do large batches, you can see response times spike like this, but it shouldn't be happening as a routine i...
We don't have an open form submission API. This method will probably work for you, however: http://developers.marketo.com/blog/make-a-marketo-form-submission-in-the-background/
Are you trying to call this over http instead of https? That would cause failure, though I don't think it would cause this failure. Maybe you've gotten prod and sandbox creds mixed...
1. Only custom activities can be written directly with the REST API2. http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#/Activities/addCus...