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Failed to sign the full code payment aggregation version.
What you want to ask is why the verification of the full-code payment aggregation version failed? Because of network transmission problems, data tampering and so on.

1. In the process of signing, due to network delay, connection interruption and other problems, data transmission is incomplete or overtime, which may also lead to signature failure.

2. In the process of data transmission, data tampering or damage will lead to signature verification failure. In the process of signature and signature verification, it is necessary to ensure the integrity of data to avoid the failure of signature verification caused by data tampering.