var timeStamp = TenPayV3UtilGetTimestamp; var nonceStr = TenPayV3UtilGetNoncestr; var body = settingSiteName + 账单 + invoiceInvoiceIdToString; var price = intinvoiceDi

The error message suggests that there is an issue with converting the value '3' to type 'System.String[]' in the JSON data at line 1, position 59.

Based on the code snippet provided, it seems that there is a problem with the data structure or formatting when creating the TransactionsRequestData object. Specifically, the value at line 1, position 59 (in the JSON data) is causing the issue.

To resolve this error, you should check the data being passed to the TransactionsRequestData constructor and ensure that the value at line 1, position 59 is properly formatted and compatible with the expected data type (System.String[] in this case)