You can do this in the Zopa app. Here's how:

Changing your automatic payment

To change the amount of your Continuous Payment Authority, you’ll need to cancel your existing one, and then set it up again with your new amount. If you want to change your payment date, check out this FAQ.

Cancelling your automatic payment

1. Open the Zopa app and click the Credit card tab.

2. Go to the ‘Manage’ section.

3. Click Cancel automatic payment.

After this is done, you can set up your new automatic payment if you want to 

Remember, if you cancel your Continuous Payment Authority without adding a new one, you’ll still need to make your monthly payments for your Zopa credit card. You can do this by paying with debit card or by bank transfer each month.