Building callback capability isn't hard, and developers can use tools like Stamplay, Twilio, and Unbounce to achieve this. The process starts by configuring an Unbounce landing page with a Phone Number field, then setting up a Twilio account and connecting it to the Unbounce form. A Blueprint template provides a pre-built solution for integrating these services, guiding users through a walkthrough wizard to connect their accounts and configure the callback flow. Behind the scenes, the blueprint triggers an API flow when the Unbounce landing page is accessed, which collects information from the form and passes it to Twilio, generating a TwiML response that instructs Twilio to make a call using a specified phone number and URL. The NodeJS Code Block responds with a customized message and connects the Unbounce lead with the customer team. With this setup, developers can spare their customers from frustrating wait times like those experienced by the author during a delayed flight.