This is 100% an issue from PayPal servers that started on October 25, 2023, mid-day eastern time. If that is not enough info to fix the issue, then IO am not sure what else to do 🤷♂️
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Having exact same issue starting late yesterday. I temporarily stopped the error by commenting out the code in rest-api-sdk-php/lib/PayPal/Validation/ UrlValidator.php if (filter_var($url, FILTER_VALIDATE_URL) === false) {
//throw new \InvalidArgumentException("$urlName is not a fully qualified URL");
} Hopefully PayPal will have more permanent fix ASAP.
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It should be noted that PayPal assigns a different Transaction ID to the buyer and seller for the same transaction. No idea why as this just causes more confusion for both parties. More details: https://www.paypal.com/gp/smarthelp/article/why-are-there-different-buyer-and-seller-transaction-ids-for-the-same-transaction-ts2265
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