Here is a list of all the possible errors that can occur during a payment made with an iOS integration (from https://github.com/hipay/hipay-fullservice-sdk-ios/blob/7c1404ad573c7f4b53a1da7343ae1bc4c3188e9c/HiPayFullservice/Core/Errors/HPFErrors.h):
Here is an example that a user might encounter:
