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To do that you should go to your Account > Billing section > Payment Method > Change Credit Card
This will create a new subscription for you over FastSpring instead of the current one on BlueSnap (28227904).
This new subscription over FastSpring will allow you to change the credit card and other details more easily in the future, if so needed.
Once you do this, do let us know so that we can make sure that everything is set right for you.