In short: OneCode: Stackable Discounts has one plan, Unlimited, for $9.90 USD every 30 days, with a 7-day free trial. Every feature is included and Shopify bills it on your normal Shopify invoice.
What's included
The Unlimited plan has no feature tiers and no usage caps from OneCode:
Unlimited OneCode discounts.
Every discount type and condition.
Bulk codes.
Support from a real person.
How billing works
When you first open OneCode, Shopify asks you to approve the plan. Your 7-day free trial starts then.
You won't be charged during the trial. If you uninstall OneCode before it ends, you pay nothing.
After the trial, Shopify charges $9.90 USD every 30 days as part of your Shopify bill.
If you uninstall the app, Shopify stops the charges. Your OneCode discounts also stop working at checkout, because they need the app installed. Closing the app page is fine; only uninstalling stops them.
Good to know
Prices are in US dollars. Shopify converts them on your bill if your billing currency is different.
Current pricing is always shown on the OneCode listing in the Shopify App Store.