WOW. I was hoping to get the chance to review this product - and I am so glad I did.
I saw them when they were offering 1 year on Appsumo, but did not jump, as I am all about ther LTD's.
First off, the UI and UX is fantasic, with a simple clean onboarding process, guiding you through the setup of your first product/service. No complaints.

The main keypoint for Abowire is customisation - everything is easily white labeled, from custom invoices with logo, customer logins, as well as deep subscription customisation options - this Saas has you covered.

Due to its financial transaction nature and SSL, it does not have CName - but this is covered by their own SDK which easily implements into your site - for a seamless UX and your own branding.
Their customer support responded withing 5 minutes, and were very helpful, providing the requested materials and answers to my quesions.

PROS: Total customisation for subscription based products, including metered usage, free trials, one time or reoccuring payments, all conneced via webhooks.
Clean interface, which is simple to pickup yet with a dashboard that shows MRR, Chrurn, Signups and all other important info you need.
Simple to use live and sanbox modes for testing.
Coupons and upsells.
Super simple to use.
Multiple ways to auth a customer:
1) Using the Drop-in checkout (native)
2)SSO via our REST API
3)SSO using OAuth2
Simple connecion you your prefered payment gateway - bank / stripe / paypal

CONS: No public road map - though they did say his was a good idea, and are open to user suggestions. I would love to see more direct implementations with programs/CMS's, for the more simple folk like myself, yet this is more of a premium product, so I get it.
Their password recovery did not seem to work - though at the time of writing this, Microsoft Azure is down - so could be connected.

TLDR: This is a premium subscription/payment product, that has performed above my expectations, Very happy.

(I received a free version as a trial, to offer my honest opinion - though my review has not been affected by this - love it).