Revenue is shared from 100% of the total sales amount, with 80% paid to the developer and 20% set aside as Cafe24’s commission fee (including all card transaction fees and PG fees). In addition, any surplus funds recovered from the remaining commission fee after fixed operating costs are reinvested back into your app's marketing costs.

As with many cases where a technical issue needs to be identified and resolved, Cafe24 Developers operates an in-house technical support center for this purpose. You can contact the support center at [Developers admin>Development support>Developer’s support] and we’ll get back to you within one business day.

You can sign up and sell your products without a business registration number.
However, you must submit a copy of your identity document in the event that a customer requests it for income and tax purposes.
The maximum settlement amount for individual merchants without a business registration number is KRW 2 million per month. If your sales exceed this limit, please contact your payment gateway service provider.

Cafe24 Developers recommends that you set a free trial period for your app. Because of activation constraints for service apps entering the initial market, the majority of developers either release their apps with a free trial period for the first few months and then charge a fee afterwards, or provide basic app functions and sell additional features via in-app purchases.

Cafe24 Developers offers open source API documentation, along with detailed instructions about how to use it.
Go to API documentation