Okay, since you weren't specific, the answer yes was for the first question,
Is version 1.3.0 compatible with ZenCart 1.5.5e?
The reference to the docs for further info was due to the fact you didn't specify what other mods you are currently using with your 1.5.5e.

If you scroll to the bottom section of the readme.html, you'll find a statement
The plugin has been validated on Zen Cart 1.5.4 and Zen Cart 1.5.5a through Zen Cart 1.5.5e, using the following shipping, order-total and payment methods:
If your shipping method, order total, or payment method is NOT listed, you'll need to experiment. This mod does not currently work with lat9's multiship mod.

We'd love to know if find anything that needs to be added to this list or something that is not working.