from datetime import datetime
from pydantic import BaseModel, ValidationError

# Define the data model for a transaction record
class TxnModel(BaseModel):
  orderID: int
  customerID: int
  productID: list[int]
  paymentMthd: str
  totalAmt: float
  invoiceTime: datetime

try:
  # Validate the sample case against the schema
  TxnModel.model_validate(sample_txn)
  print("Validated successfully!")
except ValidationError as exc:
  # Print error messages for any validation error
  print("Validation Error:")
  print(exc.errors())

# Output:
# Validated successfully