To update the payment details for your Loopcloud subscription, go to the Loopcloud Your Account page here: https://www.loopcloud.com/cloud/myaccount and then select Change payment information in the Active plan section (as highlighted below):
You will then be taken to a page to update your payment method. From here, please enter your new details, and then click 'Update payment information'.
If you have any further questions about connecting Loopcloud to your DAW, please contact our Customer Care Team - we'd be more than happy to help!