Visa information for Switzerland is available here.
In case you need a "Visa Invitation Letter" or an "Invitation and Confirmation for Presenting Authors", please log-in to ConfTool and you will find the relevant documents in the first section of the Overview. Please note that the "Visa Invitation Letter" is only available after you have registered for the conference.
For confirmation of payment you can print or download the "Payment Receipt" from the second section of the Overview. Please note that the "Payment Receipt" is only available after you have paid the registration fee.