Installation and configuration

How to install and configure the module in the online store.

or read our documentation link

Where would I find the Integration ID fir my Stamps.com account?

Call to stamps.com support for it.
I spoke with sws-support@stamps.com.
Stamps.com will take you  Integration ID. If you want to test plugin,  stamps.com can take a test account too.
Don't forgot to ask stamps.com to add your IP address to whitelist. It's important.

An one important note. You should enable "auto purchase" in your stamps.com settings.