But this has nothing to do with indulgences, which have to do with the temporal (not eternal) consequences of sin.
This may be of interest to you.
So, If God forgives a sin, there is some residual payment or debt that a man is required to pay? And that works out to be a money gift or something else of human value to some other human(s)?
In the case of restitution for theft, fine. An apology where due. Criminal /civil penalties before society only pertain to mans burden within society.
Before God, either one is forgiven (and those sins and transgressions are absolutely remembered no more) and Christ’s righteousness is attributed to them or they are guilty and condemned for not believing on Christs once for all payment before the Father.
If Purgatory didn’t exist, would there still be the need for Indulgences or do they go hand in hand?