Is it obligatory to make up for the expiations (kaffarat) for debts that were not fulfilled before repentance, or is repentance sufficient?

The meaning of "expiation of debt" is not clear. However, among the conditions for accepted repentance is fulfilling the rights of Allah and the rights of people. Expiations are not waived by repentance; rather, performing them is a condition for the validity of repentance.