Reason for mandate rejected due to error in decrypting the accepted value.
In the context of NPCI (National Payments Corporation of India), reason code 257 typically indicates an "error in decrypting the accepted value," meaning the NPCI system could not decipher the bank's response regarding a transaction, whether it was accepted or declined, due to encryption issues; essentially, the bank sent back an invalid response that the system couldn't understand. please create new mandate