集成Endicia SOAP遇zeep缺失Value元素的ValidationError错误如何修复？

Let's break down what's causing this error and how to fix it quickly.

The zeep.exceptions.ValidationError: Missing element Value (GetPostageLabel.LabelRequest.Value) message tells you exactly what's wrong: the Endicia SOAP API's GetPostageLabel operation requires a Value field in the LabelRequest structure, and your request dictionary doesn't include it.

Endicia's API uses the Value field to either specify a fixed postage amount or trigger automatic calculation (setting it to 0.0 typically lets the system compute the cost based on your weight, mail class, and address details).

Modified Code with the Required Field #

Here's your updated request dictionary with the missing Value field added, plus notes on other fields you should fill in properly:

import xml.etree.ElementTree as ET
from zeep import Client, Settings, xsd
from zeep.exceptions import Fault, TransportError, XMLSyntaxError

# Set Connection
settings = Settings(strict=False, xml_huge_tree=True)
client = Client(
    'https://elstestserver.endicia.com/LabelService/EwsLabelService.asmx?wsdl',
    settings=settings
)

# Set label request dictionary with the missing Value field
requestDictionary = {
    "MailClass": 'Priority',
    "WeightOz": 16,
    "RequesterID": 'your_valid_requester_id',  # Replace with actual ID
    "AccountID": 'your_valid_account_id',      # Replace with actual account
    "PassPhrase": 'your_valid_passphrase',    # Replace with actual passphrase
    "PartnerCustomerID": '100',
    "PartnerTransactionID": '200',
    "ToName": 'Margaret D Norris',
    "ToAddress1": '2461 Romano Street',
    "ToCity": 'Cambridge',
    "ToState": 'MA',
    "ToPostalCode": '02141',
    "FromCompany": 'Camilla R Goforth',
    "FromName": 'Camilla R Goforth',
    "ReturnAddress1": '1670 Oliverio Drive',
    "FromCity": 'Satanta',
    "FromState": 'KS',
    "FromPostalCode": '67870',
    "CostCenter":'0',
    "Value": 0.0  # Required field: set to 0 for auto-calculation, or fixed amount
}

# Try operation
try:
    response = client.service.GetPostageLabel(LabelRequest=requestDictionary)
    print(response)
except Fault as error:
    print(ET.tostring(error.detail))

Additional Tips to Avoid Future Issues #

• Verify All Required Fields: If you run into other validation errors, use Zeep's built-in tool to inspect the WSDL structure and confirm all mandatory fields:

  print(client.wsdl.dump())
  

  This will print a full breakdown of the API's operations, parameter structures, and required fields.
• Fill Credentials: Leaving RequesterID, AccountID, and PassPhrase empty will cause authentication errors once you fix the validation issue. Make sure to use valid test credentials for the Endicia sandbox server.

内容的提问来源于stack exchange，提问作者John.L