What you'll need:
To create an EasyPost Postcard
The Create Template screen displays, with default (locked) Standard Templates listed. You have to base any New template on a standard template, so it is essential to select a starting template.
IMPORTANT: For EasyPost you must select an EasyPost template as these have the address labels set up for EasyPost. All standard EasyPost templates are listed with the EasyPost icon and name prefix:
You will be prompted to confirm that you have added all required images to the template: