To build a Gatsby contact form using Fabform, you’ll need to follow these steps:

1. Install Fabform: Begin by installing Fabform in your Gatsby project. You can do this by running:

   npm install fabform --save

2. Create Your Contact Form Component: In your Gatsby project, create a new component for your contact form. For example, you can create a file named ContactForm.js in your src/components directory:

   // ContactForm.js
   import React from 'react';
   import { createFormComponent } from 'fabform';
   
   const ContactForm = () => {
       return (
           <form id="contact-form" action="/api/submit-form" method="post">
               <input type="text" name="name" placeholder="Your Name" required />
               <input type="email" name="email" placeholder="Your Email" required />
               <textarea name="message" placeholder="Your Message" required></textarea>
               <button type="submit">Send</button>
           </form>
       );
   };
   
   export default createFormComponent(ContactForm);

3. Set Up the Backend: You need a backend to handle form submissions. You can use serverless functions or any backend solution of your choice. Create a directory for your API functions and a function to handle form submissions.

   For example, if you’re using Netlify Functions, you can create a file named submit-form.js in your functions directory:

   // functions/submit-form.js
   import { createFormEndpoint } from 'fabform';
   
   export const handler = createFormEndpoint({
       // Your form configuration
       // This might include email sending, saving to a database, etc.
   });

4. Deploy Your Site: Deploy your Gatsby site with the new contact form and backend. If you’re using Netlify Functions, make sure to deploy your functions along with your site.

5. Test Your Form: Once deployed, test your contact form to ensure it’s working as expected.

By following these steps, you can create a Gatsby contact form using Fabform and handle form submissions securely. Make sure to customize the form and backend logic according to your specific requirements.