helloworld.py - How to run Python Sample Code using the Hello World API and X-Pay-Token

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helloworld.py - How to run Python Sample Code using the Hello World API and X-Pay-Token

In this "How-to" guide we will show you how to run the “Hello World” project using Visa Hello World API and and API Key - Shared Secret Authentication. The Hello World API is a simple API for testing the connectivity with the Visa Network.


Important Links:



How to Create a Visa Developer Project


Before you are able to run the “Hello World” Project, you must create a Visa Developer Portal (VDP) project and get credentials. If you haven't registered yet just click on register here, fill out the account information, agree to the terms and conditions and click on receive emails. Once you have successfully activated your account, you will see your dashboard and you are ready to go.






Once you are there, click on create your first project if this is your first project.  On the next page, you will be asked for details, such as project name, description and a list of APIs to choose from.





For this tutorial, we're going to select CyberSource Payments and click create project.







How to get Credentials


After creating your project, you will be redirected to the project summary page. You can obtain your project credentials by browsing the left side navigation menu of your project and click on “Credentials”.





What is required for the X-Pay-Token Authentication?


To be able to make an API call with X-Pay-Token Authentication, you need to have the following:

  1. Api Key
  2. Secret Key



How to run the Python Sample code of the “Hello World API” using PyCharm



Next, we'll show you how to run the Python sample code of the “Hello World API” using PyCharm. PyCharm is a dedicated Python Integrated Development Environment (IDE) providing a wide range of essential tools for Python developers and can be downloaded using below link:




In PyCharm, a project helps you organize your source code, tests, libraries that you use, build instructions, and your personal settings in a single unit.


Step 1 - Launch PyCharm


  • On the PyCharm Welcome Screen, click Create New Project.



Otherwise, from the main menu, select File | New | Project


Step 2 - In the New Project wizard, select Pure Python from the list on the left, provide the project Location and click Create.


Please make sure to specify your “Project  Interpreter”





Step 3 - Create a new file and named it “helloworld.py





Step 4 - Copy the below sample code to the “helloworld.py” file


  • Install all the required dependencies when prompt.
  • Set the below parameters:

api_key = '<YOUR API KEY>'

shared_secret = '<YOUR SHARED SECRET KEY>'




#  *(c) Copyright 2018 - 2020 Visa. All Rights Reserved.**
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#  * By accessing the Software you are agreeing to Visa's terms of use (developer.visa.com/terms) and privacy policy (developer.visa.com/privacy).In addition, all permissible uses of the Software must be in support of Visa products, programs and services provided through the Visa Developer Program (VDP) platform only (developer.visa.com). **THE SOFTWARE AND ANY ASSOCIATED INFORMATION OR DOCUMENTATION IS PROVIDED ON AN “AS IS,” “AS AVAILABLE,” “WITH ALL FAULTS” BASIS WITHOUT WARRANTY OR  CONDITION OF ANY KIND. YOUR USE IS AT YOUR OWN RISK.** All brand names are the property of their respective owners, used for identification purposes only, and do not imply product endorsement or affiliation with Visa. Any links to third party sites are for your information only and equally  do not constitute a Visa endorsement. Visa has no insight into and control over third party content and code and disclaims all liability for any such components, including continued availability and functionality. Benefits depend on implementation details and business factors and coding steps shown are exemplary only and do not reflect all necessary elements for the described capabilities. Capabilities and features are subject to Visa’s terms and conditions and may require development,implementation and resources by you based on your business and operational details. Please refer to the specific API documentation for details on the requirements, eligibility and geographic availability.*
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import datetime
import hashlib
import hmac
import json
import logging
from calendar import timegm

import requests

# DEBUG = False
DEBUG = True

# helloworld
# Sample Code for API Key- Shared Secret (X-Pay-Token)

# These two lines enable debugging at httplib level (requests->urllib3->http.client)
# You will see the REQUEST, including HEADERS and DATA, and RESPONSE with HEADERS but without DATA.
# The only thing missing will be the response.body which is not logged.
    import http.client as http_client
except ImportError:
    # Python 2
    import httplib as http_client
http_client.HTTPSConnection.debuglevel = 0

# You must initialize logging, otherwise you'll not see debug output.
requests_log = logging.getLogger("requests.packages.urllib3")
requests_log.propagate = True

print("START Sample Code for API Key- Shared Secret (X-Pay-Token)")

date = datetime.datetime.now().strftime("%Y-%m-%dT%H:%M:%S")

url = 'https://sandbox.api.visa.com/vdp/helloworld'
headers = {}
body = {}

payload = json.loads('''{}

# THIS IS EXAMPLE ONLY how will user_id and password look like
# api_key = '1WM2TT4IHPXC8DQ5I3CH21n1rEBGK-Eyv_oLdzE2VZpDqRn_U'
# shared_secret = '19JRVdej9'

api_key = '<YOUR API KEY>'
shared_secret = '<YOUR SHARED SECRET KEY>'

timeout = 10

query_string = "apiKey=" + api_key
resource_path = "helloworld"
body = ""

secret = bytes(shared_secret, 'utf-8')
timestamp = str(timegm(datetime.datetime.utcnow().timetuple()))
pre_hash_string = bytes(timestamp + resource_path + query_string + body, 'utf-8')
hash_string = hmac.new(secret, pre_hash_string, digestmod=hashlib.sha256).hexdigest()
x_pay_token = 'xv2:' + timestamp + ':' + hash_string
headers = {'x-pay-token': x_pay_token}

    response = requests.get(url + '?' + query_string,
                            # if DEBUG: print (response.text)
except Exception as e:

if DEBUG: print(response.headers)
if DEBUG: print(response.content)

var1 = str(response.status_code)
var2 = '200'
msg = " API Key- Shared Secret (X-Pay-Token) test failed"
assert var1 == var2, msg
print("END Sample Code for API Key- Shared Secret (X-Pay-Token)\n\n")





Step 5 - Compile Your Code 


  • Simply right click and run “helloworld”

Screen Shot 2020-11-12 at 5.23.31 PM.png



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Written by: @shameem@jmedlen, & @mprsic