It is easy to change your API plan with us. Billing is calculated daily, on a pro rata basis, so if you change part-way through a month, you are only charged for the days you are on that plan.
To change your API plan, log in to the Accounts System: https://accounts.whatismybrowser.com/ and click Change your plan.
When you click Change your plan, you are taken to your "Application" page; from there, click Change your Plan
A modal window will appear, showing you the plans you can select and the quota each one gives you and the monthly cost in Australian Dollars.
Select the plan you want and then click the green Change Plan button that will appear.
By clicking the Change Plan button, you agree to the change in plan and the associated adjustment of quota and costs.