You can make any changes you need to your COIN subscription or payment on the My COIN website.
First, always make sure you're logged in to the correct COIN account here:
If you would like to upgrade to COIN Plus, select "Upgrade to COIN Plus" and select "Upgrade Now." Make sure your payment information is correct before selecting, "Pay."
To the right of the COIN Plus option is COIN Pro, which has even more benefit. Check out the handy table on your account page to see what the benefit is!
If you have a COIN premium subscription, and you would like to change your payment method, you may do so here:
Adding another payment card will automatically set it as your default payment method.
Thanks for being part of the COIN economy! Happy geomining!