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Would you consider to provide more details of what you are using? This is a community support forum, meaning others here will try to provide help. This isn't where you raise a PayPal ticket expecting PayPal to help.
From your post, we can gather you are using paypal, and when checking out (I presume) it is not working.
It would be best to provide some details, like which wordpress plugin you might be using or if it is your own code. If you are not the developer of the code and are using a plugin someone produced, then you should reach out to whomever produced it and tap their support.