Pay-per-day is an option available to people who don't have an active subscription to Moldflow products but need to run studies occasionally with Autodesk Flex. Pay-per-day consumes Tokens that you have in your account once every 24 hours until all the launched analyses are complete.
When using Autodesk Flex, the default setting for solves is Use Tokens which consumes tokens on a pay-per-solve basis to minimize your cost. As someone without an active subscription, if you plan to run many analyses, you can switch to the pay-per-day option in the Analyze dialog by selecting
Figure 1. Pay-per-day option for Autodesk Flex users in the Simulation Compute Manager Analyze dialog