Chargify helps over 1,200 recurring revenue businesses manage their customer signups, coupons, taxes, setup fees, trial periods, upgrades, declined cards, sending of statements, invoicing,ACH/echeck processing with Auth.net, and much more. We even have a Portal where your customers can perform common self-service tasks.
If you want to sell subscriptions to products in your Shopify store, take a look at the extensive suite of features Chargify has to offer. Chargify Feature List
Once the app is downloaded, DO NOT UNINSTALL OR DELETE IT unless you are sure you aren't going to use it. Those actions will break the integration, and will require support to get it properly functioning again.
The Chargify app makes it easy to define products in Chargify and have those products appear in your Shopify check-out. Your Shopify customers will be able to buy your products as they usually do OR sign up for a subscription to your products, all in the same place.
Each plan allows you to manage 'x' number of customers, and there are some small feature differences between the plans, too.
Most merchants use our $129/mo "Small Business" plan, which has a nice feature set and allows you to manage 500 customers before we charge any extra fees for more customers. But if you're just trying something new, you can use our $65/mo "New Idea" plan, which includes 20 customers.
Your monthly plan price is the only fee we charge.
If you use the Chargify/Shopify app and you don't already have a Chargify account, we will create a new $65 account for you. You will not be billed for 30 days.
If you're not 100% satisfied, we'll refund your most recent month's payment.
Chargify Forums: Getting Started with the Chargify app on Shopify