The repayment commitment letter is valid if it meets the following conditions: the parties must have the corresponding capacity to conclude the contract when concluding the agreement. The intention of the parties is true. The agreement does not violate the law or the public interest. First of all, the reason for the debt must be clearly stated, and the amount of debt cannot be simply written directly. The reason for the debt should be detailed. What is the reason for the debt? How much principal is in arrears? How much or how to calculate the interest? How much or how to calculate the penalty? When should the repayment be made? When should the repayment be postponed now? Is it a one-time payment or an installment payment? wait. The more detailed your statement, the more operable it will be.
 Legal basis
 Article 465 of the Civil Code of the People's Republic of China [Effectiveness of legally established contracts] A legally established contract is protected by law.
 A lawfully formed contract is legally binding only on the parties, except as otherwise provided by law.
 Article 470 of the Civil Code of the People's Republic of China [Main contract terms and model text] The contents of a contract shall be agreed by the parties, and generally include the following terms:
 （1） The names and domiciles of the parties;
 （2） Subject matter;
 （3） Quantity;
 （4） Quality;
 （5） Price or remuneration;
 （6） Time limit, place and method of performance;
 （7） Liability for breach of contract;
 （8） Methods of dispute resolution.
 The parties may enter into a contract by reference to model versions of various contracts.