I know this problem has been asked many times before, but I cannot figure out a solution for my site. I'm getting the “This transaction is invalid. Please return to the recipient's website and try again.” whenever a customer wants to purchase a product.
Please make sure that your seller configured and inserted a valid paypal account. If seller paypal account or did not insert his correct email address then customer will not be able to purchase that seller product. Please confirm again that you have inserted your API key correctly and if you are using live mode then only live api should appear otherwise if test mode then only test api key should appear in the settings.
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