If you're using TurboTax Online, close the program, clear your Cache and Cookies, then re-open it and go back to the FILE section.
Step through until the payment screen comes up, and this should resolve your issue. When you start to enter a credit card, the program goes to a 'Payment Server' that may not be getting a good signal from your computer (a separate window should open for you to enter your info).
You may want to temporarily disable your anti-virus programs as well during the Efiling and Payment process.
@kimbee1022
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