To add or remove a charging key linked to a payment method, start by navigating to the "Charging Keys" view. Here you can see all of the charging keys connected to your account.
To see details about the charging key, tap a charging key. Press three dots in the right corner to choose which payment method the key should belong or to remove the payment method from the key.
If you select "Choose payment method," you will see all the available payment methods added to your account and can select the payment method that you would like to link to the charging key. Press save to complete changes. You will be able to see the new payment method that you added in the charging key details.