This typically means that the transaction was declined by your bank. This more commonly occurs with banks outside of the United States.
To resolve this error, you should try another credit card, preferably one drawn on a U.S.-based bank.
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PayPal (ophthoquestions@gmail.com), and we can activate your subscription manually. OphthoQuestions is our parent company whose payment processor account we use.
Just e-mail us after you have transferred the funds via PayPal so that we can activate your subscription promptly.
