The Bkper Standard Subscription has a 25% discount on annual subscription. So once you have confirmed the value of paid features, you change your billing period from monthly to annually (or from annual to monthly).
Sign in to Bkper.
Click on your Avatar in the top right Corner of the Web App.
The Billing Page opens
Press the blue "Update plan" button.
click the "Yearly" button.
Press the blue "Continue" button.
Confirm the update and press the blue "Confirm" button.
Your billing period has now changed.