Sorry to hear of the trouble sending a payment.
Are you receiving an error from PayPal during the checkout process? If yes, what type of error are you receiving? It's possible our internal security system is blocking the payment from processing. Every transaction attempt is processed through our internal security system. If the system detects any form of risk, it can block the payment from being sent or change the available funding sources for the payment. Usually, allowing a full 48 hours to pass before trying again, resolves any issues.
I hope this information helps!
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