You can check your purchase history the following ways:
[Check from View Products (comipo Play)]
Go to My Page > [View Products].
*Works that have been removed from sale will not be displayed in comipo Play
[Check via Purchase Statement]
You can issue the Purchase Statement from "Issue Purchase Statement" within My Page.
*By specifying the "Purchase Year and Month" and clicking the "Issue Purchase Statement" button, the purchase statement will be sent to your registered email address.