Tickets are a currency in Plants vs. Zombies Heroes that were introduced at the 1.10.14 update. They are used to unlock limited time event cards without the need of spending gems.
Ways to earn Tickets
Tickets are earned by winning matches. The mode played determines the number of tickets the player is going to receive. Winning a single player battle rewards 10, while winning a multiplayer match rewards 15. Keep in mind that local multiplayer does not count as winning matches due to the fact that players can cheat for tickets. These tickets can be multiplied by the use of boost depending on the classes of the hero the player is playing as.
Winning a Daily Challenge rewards 100. There are also ticket rewards for winning multiple Daily Challenges within a week. Note that Daily Challenges will not count the ticket boost.
Ways to spend Tickets
Tickets can only be spent on Weekly Event to get limited time event cards.
There were incidents of the ticket boost being glitched out. This was due to players uninstalling and reinstalling the app mutiple times, resetting the boost to max everytime. This has now been patched.