What is intervention – Intervention definition and meaning?

They say “pay per action” for when she was not required by law or agreement, express a person takes part voluntarily to settle a debt in lieu of the debtor. The creditor may refuse the intervention if it has a legitimate interest to oppose it, or if the expected benefit was made ​​under a contract concluded on a personal basis . Whoever knowingly paid the debt of another, without being subrogated
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