Yes, it is possible to use one-time purchased ticket credits in multiple events. Ticket credits are required for the generation of tickets. One ticket requires one ticket credit. Use this guide to understand how to buy ticket credits: How can I buy more credits?
If you have purchased a large number of ticket credits and all of the ticket credits are not used in a single event, it is possible to use the remaining credits for future events.
You can check the number of remaining ticket credits in your account at the 'Ticket Credits' section of your account.
While creating tickets for a new event, you will get the option of creating tickets using the previously purchased ticket credits present in your account.
If you still have questions related to this topic, please feel free to reach out to the customer relations team at support@ticket-generator.com.