This error message indicates that the request sent to the provider is not in the correct format.
Processing with SHVA
If your request contains the "reconciliation_id" parameter, please make sure that the value submitted in this field consists of digits only and does not exceed SHVA's limit of 8 digits.
For more information about "reconciliation_id" and the integration of SHVA please refer to the PaymentsOS documentation in the the following link.