You can only top up your pay2d card basic once. After upgrading to plus, you can top up your card as many times as you wish, but up to a maximum amount of € 150,- per time and a maximum amount of € 2.500,- per year.
To upgrade, simply log in at www.pay2d.nl with your loading number or username and password and click on the “Upgrade” tab. Then, follow the instructions to register. All the limits for this service can be found in our overview of limits.