We used Marketo webhooks and JSON based integration to integrate Marketo web form with our external iPass Trial service creation service. When a visitor submits a Marketo webform requesting a trial service, we have a webhook submitting an external web service. This web service creates a new trial user and password among other things. Then it returns JSON representation of the user name and password. Our Marketo web hook, reads and parses the JSON object, extracts the user name and password and sets appropriate field values in Marketo. These values are then merged in confirmation email sent to the new trial user.
This made a very significant impact on our responsiveness, reducing a great deal of manual work and considerably improving user experience.
We also used web hooks to cover the lack of functionality to schedule export of smartlist members and sending them to users. We created webhooks which allowed us to create real time export of specific smartlist members to external team members. We exported the smartlist members to specific protected Google Spreadsheets.
regards
Rajesh