We have been using Formstack and Madmimi for several years now and have marvelled at the power of both of these products. For some reason there has been no integration available from Formstack to load data into Madmimi, until today.
With the excellent help from Shawn over at Madmimi, we were able to put together a simple integration that allows Formstack forms to populate Madmimi "audience" lists quite easily. The secret is in the use of the "WebHooks" submit action in Formstack along with the Webform functionality available in Madmimi. Instead of using the webform that Madmimi generates, we created a beautiful newsletter registration page in Formstack and tied this form to a Madmimi list.
Here's how…