Reward Message Character Count - answered, thank you!

[we are halloween]

How would I go about increasing the allowed character count for reward codes? Currently, there's no indication of when we go over, and when we do, the message gets cut-off when the user receives it.

The reason I ask, is that sometimes, instead of sending the code straight out, we'll set it up as a challenge of sorts, with the reward message acting as a sort of hint as to what is/where to find - the actual code.

Thank you for your time ~ !