LongShot doesn't offer any refund for the purchase of any subscription plan. However, users can cancel their subscriptions at any time and won't be charged going forth.
Upon signup, you get 100 credits for trying out LongShot as a free trial. You can then proceed with the $1 trial (for 5 days); try before you buy. And if, at the end of the five days, you feel LongShot is worth the purchase, you can continue with that plan. You can cancel anytime; no risk involved.