When a payment was initiated on one or several documents but did not go through (or was abandoned by the user), the document(s) get the following status: Payment processing.
To pay a document in that status, the steps are the same as a normal payment with an extra step to dismiss the warning that a payment has already been initiated for the document(s):
Select the document(s).
Click on Pay documents.
A warning message is displayed to let you know that a payment has been started for this document.
To continue, you'll first have to click on Dismiss.Choose your payment method then click on Pay documents.