We are using your form submission APIs(https://visitor2.constantcontact.com/api/signup). It was working fine earlier. We found that there is some error coming in yoursignup-form.jsfile(see attached) and form is not working due to this.
Thank you for reaching out to Constant Contact's API Support.
We currently have not had other reports of this issue. Can you please let me know the website that your sign-up form is located on? If you prefer to keep this private feel free to email us at firstname.lastname@example.org.