Is it possible to edit the form using unique id's value?

Our initial survey is generated from a button on our website - and we pass our UserID field in the URL parameter (or within the embed code to you). I need for our user to be able to use that button on our site to return to the same survey and their existing submission survey page - where they will see their existing answers and be able to edit and save them. The submission would be updated and that's the only logic I need related to updates.

Question: is there a way I can always go to an existing survey submission based on a match of the UserId parameter we send (using a hidden field)? If there is no existing submission for that UserID then a new submission would be created. I never want a user to create a new submission if they've already completed it once.

We can't send the user an autoresponder email, because we're basically just using the survey to get a couple checkbox settings for a feature. And I don't have a way to program the storing of the Edit link. I just need editing to based on my UserID parameter.

It has now been simplified. Instead searching for the unique ID, you can just use the start {edit_link} parameter in your email notification, this will also pull / allows to edit the submitted data.

Let us know if you have any questions or if you need further assistance.