Şunu aradınız:: repayable (İngilizce - Japonca)

repayable on demand
必要に応じて返済

japan's oda largely consists of concessionary yen credit repayable in 30 years, carrying an interest rate of 2% or so.
日本のＯＤＡは返済期間３０年、利率２％前後という条件の緩い円借款が大部分を占める。