In some cases this page may say that you do not have a paid membership when you actually do have one. You should still be able to change billing.
[s2Member-Pro-Stripe-Form update="1" desc="Update your billing information." default_country_code="US" captcha="0" /]
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[s2Member-Pro-PayPal-Form update="1" desc="Update your billing information." accept="paypal,visa,mastercard,amex,discover,maestro,solo" default_country_code="" captcha="0" /]