Hello,
Unfortunately we are not able to provide an inbound phone number for our API Support team due to our very limited staffing. If you need assistance with an issue, you can email the details to us at webserivces@constantcontact.com and we may be able to schedule a time for a phone call if the issue cannot be reasonably and quickly resolved for you by email.
Sincerely,
Elijah G.
API Support Engineer
