The implementation for the same can be found in the footer section under “footer newsletter.” 
src
 └── components
      └── footer
            └── footer-newsletter
                  ├── footer-newsletter-controller.tsx
                  └── footer-newsletter.tsx
Integrating the subscribeToNewsLetter of BigCommerce is as simple as implementing the /JavaScript form. Just create a simple HTML form with the input field as a text or email type, ensuring proper validations. Upon submission of the form, you will receive the email address from the form data. Now, you just need to import EcommerceService from ‘experro-storefront’. EcommerceService provides an asynchronous method called subscribeToNewsLetter('sample@experro.com') which accepts the email address. It will return the response as success. If the provided email address is already registered, you will receive a valid error message in the response’s Error.message. For detailed implementation, refer to footer-newsletter.tsx and footer-newslatter-controller.tsx.

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signUp Handler Method

const signUpHandler = async (data: any) => {
  const formSubmit = await EcommerceService.subscribeToNewsLetter(data?.email);
  if (formSubmit?.Status === 'success') {
    toast.success(formSubmit.Data);
  } else {
    toast.error(formSubmit.Error.message);
  }
  setEmailValue('');
};