Art. 12 SchKG; conditional payment to the debt enforcement office; only unconditional transfer to the office for the creditor constitutes payment within the meaning of the Act. A deposit subject to a waiver or full-settlement condition does not extinguish the debt for the amount deposited, but merely entrusts the office with safekeeping and possible subsequent payment if the condition is accepted. Whether such conduct of the office is challengeable under Art. 17 SchKG may remain open where the creditor has not complied with the condition for release.