Do you have wireframes or a mockup or a landing page? One of those might help to communicate your idea. As written I have no idea what kind of service you're actually proposing. (User testing? Surveys? NPS?)
After the developers sign up with their products, they will add a method that we will provide (iframes, API calls, SDK integrations with auth-keys) to a part of their projects (for example, the landing page or the dashboard of their applications) and we will collect feedback from their users. Then, at certain intervals, we will extract various insights from this feedback and provide developers with data that will guide them in their next steps.
The feedback collected can be in the form of surveys or open-ended questions. As long as we have clean data that we can analyze.