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Hi @terryfindlay,
Please see the article below for instructions (which depend slightly on your payment method): https://really-simple-ssl.com/updating-your-payment-method-renewal-failing/
While we are happy to assist with the Pro plugin, please know that we may only discuss the Free version on these forums. So, for further questions about this, please reach out directly via support(at)really-simple-ssl.com.
Kind regards, Jarno