I'm looking for another answer than the one stated here. I want to see the credits "transfered" in my app. Insights but with test users transactions, in order to ensure that callback has no mistakes. I'm afraid it can't be done, but if someone has another option, that could be helpful as well.
Your only options are to use testers, and live with the fact that their transactions won't appear in the payout reports, or use real credits and real money