Lob.com - a great web app for the custom postcards/letters sending, but one problem - official gem has very limited features implementation. For example Templates endpoint and other things.
Btw you can use - my fork with tiny patch for the templates support.
Start using this gem - super simple, for example - little service, which takes clien list and params:
And we got output JSON:
That’s it, you have created your first Postcard via Lob.com!