There are thousands of ways to connect Mailchimp with business-critical apps using Zapier, but sometimes an app may not have a Zapier integration, making it necessary to use webhooks as a solution. Webhooks by Zapier is a premium app that allows users to connect almost any app with Mailchimp, even if it doesn't have a Zapier integration. To set up this connection, users need to ensure the account they want to pull information from has webhooks enabled and set up correctly. They then create a new workflow in HighLevel or another supported app, add a webhook trigger, and map the data points they want to send to Mailchimp. Once the setup is complete, users can test their webhooks step by sending sample records through a webhook to Mailchimp, ensuring that the connection works as expected.