Hi, I built an app that should help you accomplish this. It's an eCard app integration for Squarespace. Simply customize and upload your ecards then embed the widget on your Squarespace website. Website visitors will select from your ecards, then they will be able to send them to their friends via email. The widget also supports sharing via SMS, Facebook, Instagram, etc. Senders can also opt-in to your mailing list and there are tons of analytics. Plus ecommerce options as well. Here's the website: https://ecardwidget.com
Happy to answer any questions!
Best,
Tim
