In the case of trademark infringement, if the obligee buys the product on its own in the market, there is no invoice. Testifying in court is legally binding.

However, according to the law, the evidence must be verified before it can be used as the basis for ascertaining the facts. If there is only the confession of the person who bought the product and no other evidence, it is considered that the evidence is insufficient and the case is lost.

If the owner refuses to issue an invoice, the buyer can use witness testimony or take photos to obtain evidence to ensure victory.

The following are the provisions of the law on evidence.

People's Republic of China (PRC) Civil Procedure Law

Article 63 Evidence includes:

(a) Statements of the parties;

(2) Documentary evidence;

(3) Physical evidence;

(4) Audio-visual materials;

(5) Electronic data;

(6) Testimony of witnesses;

(7) Appraisal opinions;

(8) Records of the inquest.

Evidence must be verified before it can be used as a basis for ascertaining facts.

Article 64 The parties have the responsibility to provide evidence of their own claims.

The people's court shall investigate and collect evidence that the parties and their agents ad litem cannot collect on their own due to objective reasons, or evidence that the people's court considers necessary for hearing a case.

The people's court shall comprehensively and objectively examine and verify the evidence in accordance with legal procedures.