PayPal is the popular online payment transaction which has a huge fan all over the world for its amazing features. It is prompt, easy to use, and systematic which make the new user handle it much better. It is chosen as the default payment method while doing business for the international. But, you can’t get away with the shortcomings interlinked with it. PayPal API error code 10426 occurs when the payment failed due to the invalid argument. The origin of the problem occurs when the transaction was denied due to the Item total amount is invalid. To fix the problem completely, you can either choose to read online blogs or contact the technicians at PayPal Customer Service Number to get instant support on your problems.