To get started with postcards, you've reached the right page. You can design postcards with HTML or by using Inkit's template builder which has features for fonts, colors, and image uploads. If you're looking for Inkit's Send API visit our Docs.
The back of the postcard requires either a message or content (HTML, PNG, JPEG). We don't accept PDF file types. If you choose to include content, follow the provided templates, to leave room for postage:
The return address is required for postcards.