Mailchimp form integration + updating existing contact

[majnick (Nik V)]

Mighty Webflow braintrust,

First of all let me thank you all for being such an awesome community - Just browsing through the discussions helped me a lot in the past. This is my first active question since I couldn’t find any past threads discussing this issue:

I’ve built a custom sign up form in Webflow that sends sign up information (Name + Email + Group – group is used to track sign up source) to my Mailchimp audience (similar to what’s discussed in this thread: Mailchimp Groups - #20 by fmcausby). Everything works fine so far.

Now, I need already EXISTING contacts in this audience to be UPDATED once they complete the form. The form completion is associated with a group change which in return triggers a welcome email.

Any ideas how I can make ensure that existing contacts are updated once they complete the form?

Currently, if somebody signs up with already existing Name + Email NOTHING happens, i.e. the contact in Mailchimp stays keeps their old Name + Email + Group.

Thanks in advance!

PS: I’ve used a similar custom embedded code to combine the form completion with Mailchimp audience POST:

<div class="mc-field-group input-group" style="display:none">
<strong>Subscriber Groups </strong>
<ul>
<li><input type="checkbox" value="1" name="group[10397][1]" id="mce-group[10397]-10397-0">
<label for="mce-group[10397]-10397-0">Company News</label></li>
</ul>
</div>

[Gail_Ranger]

Take a look at

Is there a way to update MailChimp fields of a person's old record?

Hi, I am using Webflow form to set up sign up to MailChimp. Is there a way to update the MailChimp records if the same person (same email address) fills in the Webflow form again with different inputs? eg. In the old record on MailChimp, the person’s COMPANY is Old Day Co. When the same person fills in the Webflow form again, he enters ABC Inc. I think this new submission should update the COMPANY field, but it cannot. Any idea? Thank you very much.