First always check the url, sometime while copy the url we miss or mistype some alphabet which leds to wrong url or website which could be one reason for paypal 403 forbidden. For this always click on browser. Then open paypal website. Thencheck whether the url has proper address with any special character or not. This is most common reason for the error, just make sure you type correct url and double check before panicking. Learn also: https://portfo.org/read-blog/11937
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Learn also: https://portfo.org/read-blog/11937