helloworld.py - How to run Python Sample Code using the Hello World API and Mutual SSL

Visa Employee

helloworld.py - How to run Python Sample Code using the Hello World API and Mutual SSL

In this "How-to" guide we will show you how to run the “Hello World” project using Visa Hello World API and Two-Way SSL (Mutual 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 “Visa Direct” 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 Two-Way SSL (Mutual Authentication)?


To be able to make an API call with 2-way SSL authentication, you need to have the following:


  1. User ID
  2. Password
  3. Your client cert
  4. Your private key previously downloaded
  5. Visa Development Platform Certificate




You will need to download the project certificate as well as the common certificates - Visa Developer Platform certificate and DigiCert Certificate and save them in the correct directory. 



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:

user_id = '<YOUR USER ID>'

password = '<YOUR PASSWORD>'








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import datetime
import json
import logging

import requests

# DEBUG = False
DEBUG = True

# helloworld
# Sample Code for Two-Way (Mutual) SSL

# 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 Two-Way (Mutual) SSL")

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
# user_id = '1WM2TT4IHPXC8DQ5I3CH21n1rEBGK-Eyv_oLdzE2VZpDqRn_U'
# password = '19JRVdej9'

user_id = '<YOUR USER ID>'
password = '<YOUR PASSWORD>'

# THIS IS EXAMPLE ONLY how will cert and key look like
# cert = 'cert.pem'
# key = 'key_83d11ea6-a22d-4e52-b310-e0558816727d.pem'


timeout = 10

    response = requests.get(url,
                            # verify = ('put the CA certificate pem file path here'),
                            cert=(cert, key),
                            # headers = headers,
                            auth=(user_id, password),
                            # data = body,
                            # json = payload,
                            # 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 = " Two-Way (Mutual) SSL test failed"
assert var1 == var2, msg





Step 5 - Compile Your Code 


  • Simply right click and run “helloworld”

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



Want more? Join the Visa Developer Community to get alerts on the latest tutorials, guides and new developer resources. Stay tuned for more in the series. 


Written by: @shameem@jmedlen, & @mprsic